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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
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income $ 37,598 $ 53,639
Basic weighted-average shares outstanding 121,049 125,398
Dilutive impact of stock options and restricted shares 685 726
Diluted weighted-average shares outstanding 121,734 126,124
Net income per common share:    
Basic $ 0.31 $ 0.43
Diluted $ 0.31 $ 0.43