Annual report pursuant to Section 13 and 15(d)

Consolidated Statement of Changes In Shareholders' Equity

v2.4.1.9
Consolidated Statement of Changes In Shareholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock, Regular
Common Stock, Special
Common Stock Outstanding
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Common Stock, Regular
Retained Earnings
Common Stock, Special
Treasury Stock
Beginning Balances at Dec. 31, 2011 $ 544,574us-gaap_StockholdersEquity     $ 1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 386,920us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 181,820us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    $ (24,167)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Beginning Balances (in shares) at Dec. 31, 2011       74,352,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
        2,869,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Cash dividends   (23,798)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockRegularMember
(59,034)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockSpecialMember
      (23,798)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockRegularMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(59,034)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockSpecialMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Share-based compensation 12,398us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       12,398us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Stock issued, net of forfeitures, shares       898,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Shares, RSUs surrendered for payroll taxes, value (5,329)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation       (5,329)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Other 392us-gaap_StockholdersEquityOther       2,197us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(1,805)us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Net income 71,984us-gaap_NetIncomeLoss         71,984us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Ending Balances at Dec. 31, 2012 541,187us-gaap_StockholdersEquity     1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
396,186us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
169,167us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (24,167)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balances (in shares) at Dec. 31, 2012       75,250,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
        2,869,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Cash dividends   (27,098)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockRegularMember
(31,748)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockSpecialMember
      (27,098)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockRegularMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(31,748)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockSpecialMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Share-based compensation 11,525us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       11,525us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Stock issued, net of forfeitures, shares       342,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Shares, RSUs surrendered for payroll taxes, value (2,370)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation       (2,370)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Other (2,208)us-gaap_StockholdersEquityOther       (1,777)us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(431)us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Net income 51,322us-gaap_NetIncomeLoss         51,322us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Ending Balances at Dec. 31, 2013 540,610us-gaap_StockholdersEquity     1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
403,564us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
161,212us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (24,167)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balances (in shares) at Dec. 31, 2013 75,591,699us-gaap_CommonStockSharesOutstanding     75,592,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
        2,869,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Cash dividends   (30,260)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockRegularMember
        (30,260)us-gaap_DividendsCash
/ us-gaap_StatementClassOfStockAxis
= wti_CommonStockRegularMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   
Share-based compensation 14,744us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue       14,744us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Stock issued, net of forfeitures, shares       307,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Shares, RSUs surrendered for payroll taxes, value (848)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation       (848)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Other (3,277)us-gaap_StockholdersEquityOther       (2,880)us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(397)us-gaap_StockholdersEquityOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Net income (11,661)us-gaap_NetIncomeLoss         (11,661)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
     
Ending Balances at Dec. 31, 2014 $ 509,308us-gaap_StockholdersEquity     $ 1us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 414,580us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 118,894us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    $ (24,167)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
Ending Balances (in shares) at Dec. 31, 2014 75,899,415us-gaap_CommonStockSharesOutstanding     75,899,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
        2,869,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember