CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Shares	Total
Balance at Dec. 31, 2020	$ 289	$ 119,891	$ 562,084	$ (45,937)	$ 636,327
Balance (in shares) at Dec. 31, 2020	28,943			(2,773)
Stock-based compensation expense		1,066			1,066
Restricted stock units vested (in shares)	5
Shares withheld for taxes paid on stock awards		(82)			(82)
Net income			10,184		10,184
Balance at Mar. 31, 2021	$ 289	120,875	572,268	$ (45,937)	647,495
Balance (in shares) at Mar. 31, 2021	28,948			(2,773)
Balance at Dec. 31, 2021	$ 290	122,354	605,766	$ (45,937)	682,473
Balance (in shares) at Dec. 31, 2021	29,025			(2,773)
Stock-based compensation expense		1,382			1,382
Restricted stock units vested (in shares)	9
Shares withheld for taxes paid on stock awards		(165)			(165)
Net income			21,792		21,792
Balance at Mar. 31, 2022	$ 290	$ 123,571	$ 627,558	$ (45,937)	$ 705,482
Balance (in shares) at Mar. 31, 2022	29,034			(2,773)