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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
Sep. 30, 2018
 [1]
Jun. 30, 2018
 [1]
Mar. 31, 2018
 [1]
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2016
 [1]
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic:                              
Net income                         $ 152,276 $ 100,232 $ 97,707
Average common shares outstanding (in shares)                         34,306 34,139 33,587
Basic net income per common share (in dollars per share) $ 1.17 $ 1.14 $ 1.09 $ 1.04 $ 0.46 $ 0.87 $ 0.81 $ 0.79 $ 0.76 $ 0.73 $ 0.72 $ 0.7 $ 4.44 $ 2.94 $ 2.91
Diluted:                              
Net income                         $ 152,276 $ 100,232 $ 97,707
Average common shares outstanding (in shares)                         34,306 34,139 33,587
Adjustment for common share equivalents (in shares)                         137 182 594
Average common shares outstanding-diluted (in shares)                         34,443 34,321 34,181
Diluted net income per common share (in dollars per share) $ 1.17 $ 1.13 $ 1.08 $ 1.04 $ 0.45 $ 0.87 $ 0.81 $ 0.79 $ 0.75 $ 0.72 $ 0.71 $ 0.68 $ 4.42 $ 2.92 $ 2.86
Anti-dilutive shares (in shares)                             7
[1] Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.