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Earnings Per Share (Weighted-Average Shares of Common Stock Outstanding Used in Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income $ 9,233 $ 32,711 $ 46,832 $ 86,348
Basic weighted-average shares outstanding 121,455 125,125 121,253 125,261
Dilutive impact of stock options and restricted shares 982 658 834 660
Diluted weighted-average shares outstanding 122,437 125,783 122,087 125,921
Net income per common share:        
Basic $ 0.08 $ 0.26 $ 0.39 $ 0.69
Diluted $ 0.08 $ 0.26 $ 0.38 $ 0.69