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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Basic EPS, Net Income $ 68,274 $ 29,481 $ 187,189 $ 62,884
Basic EPS, Shares (in shares) 97,433 97,189 97,377 97,165
Basic EPS, Per Share Amount (in dollars per share) $ 0.70 $ 0.30 $ 1.92 $ 0.65
Effect of dilutive securities        
Diluted EPS, Net Income $ 68,274 $ 29,481 $ 187,189 $ 62,884
Diluted EPS, Shares (in shares) 98,080 97,693 97,942 97,648
Diluted EPS, Per Share Amount (in dollars per share) $ 0.70 $ 0.30 $ 1.91 $ 0.64
Stock options        
Effect of dilutive securities        
Effect of dilutive securities (in shares) 100 24 70 26
Non-vested restricted stock        
Effect of dilutive securities        
Effect of dilutive securities (in shares) 331 287 310 275
Performance share awards        
Effect of dilutive securities        
Effect of dilutive securities (in shares) 216 193 185 182