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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation charged to operating income $ 2,892 $ 3,887 $ 5,708 $ 7,644
Total charged to operating income 2,892 5,894 5,839 12,734
General And Administrative Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation charged to operating income $ 2,892 3,887 5,708 7,644
Cash-based incentive compensation charged to operating income [1]   1,532 (233) 3,313
Lease Operating Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Cash-based incentive compensation charged to operating income   $ 475 $ 364 $ 1,777
[1] Adjustments to true up estimates to actual payments resulted in net credit balances to expense for the six months ended June 30, 2015.