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Net Income per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic:
Net income	$ 33,749	$ 35,715
Basic net income per common share (in dollars per share)	$ 0.98	$ 1.04
Diluted:
Net income	$ 33,749	$ 35,715
Average common shares outstanding (in shares)	34,481	34,261
Adjustment for common share equivalents (in shares)	55	145
Average common shares outstanding-diluted (in shares)	34,536	34,406
Diluted net income per common share (in dollars per share)	$ 0.98	$ 1.04
Anti-dilutive shares (in shares)	3

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