Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Impact of adoption of ASC 606	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Impact of adoption of ASC 606
Beginning balance (in shares) at Dec. 31, 2017			0	16,268,000
Beginning balance at Dec. 31, 2017	$ 289,406	$ (278)	$ 0	$ 163	$ 180,674	$ 108,569	$ (278)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee benefit plans (in shares)				223,000
Issuance of common stock under employee benefit plans	0			$ 2	(2)
Deemed repurchased shares of common and restricted stock for tax withholding (in shares)				(66,000)
Deemed repurchased shares of common and restricted stock for tax withholding	(1,823)			$ (1)	(1,822)
Stock-based compensation	$ 8,322				8,322
Repurchased and retired shares of common stock (in shares)	0
Net income	$ 25,639					25,639
Ending balance (in shares) at Dec. 31, 2018			0	16,425,000
Ending balance at Dec. 31, 2018	321,266		$ 0	$ 164	187,172	133,930
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee benefit plans (in shares)				252,000
Issuance of common stock under employee benefit plans	$ 0			$ 3	(3)
Deemed repurchased shares of common and restricted stock for tax withholding (in shares)	(1,416,304)			(83,000)
Deemed repurchased shares of common and restricted stock for tax withholding	$ (2,510)			$ (1)	(2,509)
Stock-based compensation	$ 5,960				5,960
Repurchased and retired shares of common stock (in shares)	(1,416,304)			(1,416,000)
Repurchased and retired shares of common stock	$ (37,996)			$ (14)		(37,982)
Net income	10,013					10,013
Ending balance (in shares) at Dec. 31, 2019			0	15,178,000
Ending balance at Dec. 31, 2019	296,733		$ 0	$ 152	190,620	105,961
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee benefit plans (in shares)				258,000
Issuance of common stock under employee benefit plans	0			$ 2	(2)
Deemed repurchased shares of common and restricted stock for tax withholding (in shares)				(79,000)
Deemed repurchased shares of common and restricted stock for tax withholding	(2,097)			$ (1)	(2,096)
Stock-based compensation	$ 7,075				7,075
Repurchased and retired shares of common stock (in shares)	(547,563)			(548,000)
Repurchased and retired shares of common stock	$ (13,608)			$ (5)		(13,603)
Net income	18,822					18,822
Ending balance (in shares) at Dec. 31, 2020			0	14,809,000
Ending balance at Dec. 31, 2020	$ 306,925		$ 0	$ 148	$ 195,597	$ 111,180