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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic:
Net income	$ 28,856	$ 37,243	$ 51,979	$ 70,992
Average common shares outstanding (in shares)	32,225	34,540	32,537	34,511
Basic net income per common share (in dollars per share)	$ 0.90	$ 1.08	$ 1.60	$ 2.06
Diluted:
Net income	$ 28,856	$ 37,243	$ 51,979	$ 70,992
Average common shares outstanding (in shares)	32,225	34,540	32,537	34,511
Adjustment for common share equivalents (in shares)	16	25	24	38
Average common shares outstanding-diluted (in shares)	32,241	34,565	32,561	34,549
Diluted net income per common share (in dollars per share)	$ 0.90	$ 1.08	$ 1.60	$ 2.05
Anti-dilutive shares	49	2	26	19

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