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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Basic 104,530 103,987
Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards 794 849
Diluted 105,324 104,836
Net income available to common shareholders $ 100,900 $ 73,342
Earnings (loss) per share - basic $ 0.97 $ 0.71
Earnings (loss) per share - diluted $ 0.96 $ 0.70
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share 0