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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic:        
Net income $ 37,243 $ 37,296 $ 70,992 $ 73,011
Basic net income per common share (in dollars per share) $ 1.08 $ 1.09 $ 2.06 $ 2.13
Diluted:        
Net income $ 37,243 $ 37,296 $ 70,992 $ 73,011
Average common shares outstanding (in shares) 34,540 34,306 34,511 34,283
Adjustment for common share equivalents (in shares) 25 142 38 145
Average common shares outstanding-diluted (in shares) 34,565 34,448 34,549 34,428
Diluted net income per common share (in dollars per share) $ 1.08 $ 1.08 $ 2.05 $ 2.12
Anti-dilutive shares (in shares) 2   19