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Reconciliation of Earnings Per Share (EPS) - Earnings Per Share Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net Income (Loss) $ (26,572) $ (18,486) $ 160,617 $ 44,398
Basic EPS, Shares (in shares) 97,485 97,198 97,413 97,176
Basic EPS, Per Share Amount (in dollars per share) $ (0.27) $ (0.19) $ 1.65 $ 0.46
Effect of dilutive securities        
Net Income (Loss) $ (26,572) $ (18,486) $ 160,617 $ 44,398
Diluted EPS, Shares (in shares) 97,485 97,198 98,013 97,678
Diluted EPS, Per Share Amount (in dollars per share) $ (0.27) $ (0.19) $ 1.64 $ 0.45
Stock options        
Effect of dilutive securities        
Effect of dilutive securities (in shares) 0 0 92 25
Non-vested restricted stock        
Effect of dilutive securities        
Effect of dilutive securities (in shares) 0 0 293 284
Performance share awards        
Effect of dilutive securities        
Effect of dilutive securities (in shares) 0 0 215 193