Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Income Taxes Computed to Income Tax Expense (Benefit) (Details)

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Income Taxes - Reconciliation of Income Taxes Computed to Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax expense (benefit) at the federal statutory rate $ (436,696) $ (5,642) $ 28,033
Share-based compensation 2,940    
State income taxes (2,343) 263 343
Valuation allowance 232,925    
Other 190 920 398
Income tax expense (benefit) $ (202,984) $ (4,459) $ 28,774
Income tax expense (benefit) at the federal statutory rate, tax rate 35.00% 35.00% 35.00%
Share-based compensation, tax rate (0.20%)    
State income taxes, tax rate 0.20% (1.60%) 0.40%
Valuation allowance, tax rate (18.70%)    
Other, tax rate   (5.70%) 0.50%
Effective income tax rate, total 16.30% 27.70% 35.90%