CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Total
BALANCE at Dec. 31, 2020	$ 411	$ (129,243)	$ 322,451	$ 502,810	$ 696,429
BALANCE (in shares) at Dec. 31, 2020	41,123,365
BALANCE (in shares) at Dec. 31, 2020		(4,935,186)
Increase (Decrease) in Stockholders' Equity
Net income				26,491	26,491
Issuance of Stock:
Issuance of shares for options exercised		$ 1,616	(211)		1,405
Issuance of shares for options exercised (in shares)		61,454
Issuance of restricted stock & performance stock		$ 777	1,431		2,208
Issuance of restricted stock & performance stock (in shares)		29,544
Shares received in lieu of tax withholding payment on vested restricted stock		$ (854)			(854)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)		(11,424)
Stock-based compensation			2,472		2,472
Dividends				(4,163)	(4,163)
Share repurchase		$ (885)			(885)
Share repurchase (in shares)		(13,250)
BALANCE at Mar. 31, 2021	$ 411	$ (128,589)	326,143	525,138	723,103
BALANCE (in shares) at Mar. 31, 2021	41,123,365
BALANCE (in shares) at Mar. 31, 2021		(4,868,862)
BALANCE at Dec. 31, 2021	$ 411	$ (150,580)	327,061	628,774	$ 805,666
BALANCE (in shares) at Dec. 31, 2021	41,123,365				41,123,365
BALANCE (in shares) at Dec. 31, 2021		(5,032,311)			5,032,311
Increase (Decrease) in Stockholders' Equity
Net income				86,762	$ 86,762
Issuance of Stock:
Issuance of restricted stock & performance stock		$ 1,232	2,312		3,544
Issuance of restricted stock & performance stock (in shares)		38,863
Shares received in lieu of tax withholding payment on vested restricted stock		$ (1,399)			(1,399)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)		(15,348)
Stock-based compensation			2,605		2,605
Dividends				(4,673)	(4,673)
Share repurchase		$ (14,097)			(14,097)
Share repurchase (in shares)		(161,614)
BALANCE at Mar. 31, 2022	$ 411	$ (164,844)	$ 331,978	$ 710,863	$ 878,408
BALANCE (in shares) at Mar. 31, 2022	41,123,365				41,123,365
BALANCE (in shares) at Mar. 31, 2022		(5,170,410)			5,170,410