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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Aug. 12, 2016
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capped Call, Cap Price | $ / shares         $ 60.00
Dilutive effect of non-vested RSUs and contingent PSUs   1,590 0 0  
Anti-dilutive shares excluded from earnings per share   0 264 280  
Earnings Per Share Reconciliation [Abstract]          
Net income (loss) | $   $ 508,407 $ (160,843) $ (757,744)  
Basic weighted-average common shares outstanding   111,912 111,428 76,568  
Dilutive effect of Senior Convertible Notes   0 0 0  
Diluted weighted-average common shares outstanding   113,502 111,428 76,568  
Basic net income (loss) per common share | $ / shares   $ 4.54 $ (1.44) $ (9.90)  
Diluted net income (loss) per common share | $ / shares   $ 4.48 $ (1.44) $ (9.90)  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
Multiplier applied to PSU awards at settlement 0 0 0 0.2  
Minimum [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Multiplier applied to PSU awards at settlement 0 0      
Maximum [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Multiplier applied to PSU awards at settlement 2 2      
1.50% Senior Convertible Notes Due 2021 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Senior Convertible Notes, principal amount | $ $ 172,500 $ 172,500 $ 172,500   $ 172,500
Senior Convertible Notes, conversion price | $ / shares $ 40.50 $ 40.50