Annual report pursuant to Section 13 and 15(d)

Share-Based Awards and Cash-Based Awards - Summary of Compensation Expense Related to Share-Based Awards and Cash-Based Awards (Details)

v3.10.0.1
Share-Based Awards and Cash-Based Awards - Summary of Compensation Expense Related to Share-Based Awards and Cash-Based Awards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation charged to operating income $ 3,540 $ 8,065 $ 11,013
Total charged to operating income 16,722 15,198 11,013
General And Administrative Expense      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation charged to operating income 3,540 8,065 $ 11,013
Cash-based incentive compensation charged to operating income 9,586 5,032  
Lease Operating Expense      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Cash-based incentive compensation charged to operating income $ 3,596 $ 2,101