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Net Income Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 138,237	$ 151,099	$ 135,413
Less distributed and undistributed earnings allocated to participating securities	782	1,759	1,875
Net income allocated to common shares	$ 137,455	$ 149,340	$ 133,538
Weighted average common shares outstanding	38,503	40,186	41,217
Incremental shares from assumed time-vested and performance-based RSU awards and conversions of common stock options	317	166	289
Adjusted weighted average common shares outstanding	38,820	40,352	41,506
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect	133	0	0

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