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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic:        
Net income $ 38,948 $ 29,874 $ 111,959 $ 84,663
Average common shares outstanding (in shares) 34,309 34,174 34,292 34,124
Basic net income per common share (in dollars per share) $ 1.14 $ 0.87 $ 3.26 $ 2.48
Diluted:        
Net income $ 38,948 $ 29,874 $ 111,959 $ 84,663
Average common shares outstanding (in shares) 34,309 34,174 34,292 34,124
Adjustment for common share equivalents (in shares) 152 164 152 192
Average common shares outstanding-diluted (in shares) 34,461 34,338 34,444 34,316
Diluted net income per common share (in dollars per share) $ 1.13 $ 0.87 $ 3.25 $ 2.47
Anti-dilutive shares (in shares) 3