Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Schedule of Share-based Compensation Expense) (Details)

v3.19.3.a.u2
Share-Based Compensation (Schedule of Share-based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense - Equity-based $ 14,322 $ 9,460 $ 10,225
Share-based compensation expense - Liability-based 1,464 336 4,294
Settled share-based awards 3,024 0 6,351
Share-based compensation - capitalized oil and gas properties 4,700 3,400 3,200
General and Administrative Expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation 11,100 6,400 5,000
CFO      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Settled share-based awards     6,400
RSU equity awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense - Equity-based 14,322 9,460 10,225
Share-based compensation expense - Liability-based 0 0 0
Cash-settleable RSU awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense - Equity-based 0 0 0
Share-based compensation expense - Liability-based 1,021 336 4,294
Cash-settled SARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense - Equity-based 0 0 0
Share-based compensation expense - Liability-based $ 443 $ 0 $ 0