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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net income $ 42,655 $ 41,635
Denominator:    
Weighted-average common shares for calculating basic earnings per share (shares) 43,518 46,426
Stock options and nonvested stock awards (shares) 140 53
Weighted-average common shares for calculating diluted earnings per share (shares) 43,658 46,479
Earnings per share:    
Basic (in dollars per share) $ 0.98 $ 0.90
Diluted (in dollars per share) $ 0.98 $ 0.90