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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation charged to operating income $ 2,605 $ 3,754 $ 8,313 $ 11,398
Total charged to operating income 2,605 7,064 8,444 19,799
General And Administrative Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Share-based compensation charged to operating income $ 2,605 3,754 8,313 11,398
Cash-based incentive compensation charged to operating income [1]   2,724 (233) 6,038
Lease Operating Expense        
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]        
Cash-based incentive compensation charged to operating income   $ 586 $ 364 $ 2,363
[1] Adjustments to true up estimates to actual payments resulted in net credit balances to expense for the nine months ended September 30, 2015.