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Net Income per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic:
Net income	$ 23,123	$ 33,749
Average common shares outstanding (in shares)	32,850	34,481
Basic net income per common share (in dollars per share)	$ 0.70	$ 0.98
Diluted:
Net income	$ 23,123	$ 33,749
Average common shares outstanding (in shares)	32,850	34,481
Adjustment for common share equivalents (in shares)	25	55
Average common shares outstanding-diluted (in shares)	32,875	34,536
Diluted net income per common share (in dollars per share)	$ 0.70	$ 0.98
Anti-dilutive shares	26	3

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