Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense (Details)

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Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation charged to operating income $ 2,816 $ 3,758
Total charged to operating income 2,944 6,841
General and Administrative    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation charged to operating income 2,816 3,758
Cash-based incentive compensation charged to operating income [1] (233) 1,781
Lease Operating Expense    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Cash-based incentive compensation charged to operating income $ 361 $ 1,302
[1] Adjustments to true up estimates to actual payments resulted in net credit balances to expense for the three months ended March 31, 2015.