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, 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					59,456
BALANCE at Jun. 30, 2021	$ 411	$ (128,503)	326,179	553,925	752,012
BALANCE (in shares) at Jun. 30, 2021	41,123,365
BALANCE (in shares) at Jun. 30, 2021		(4,774,785)
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)
Increase (Decrease) in Stockholders' Equity
Net income				32,965	32,965
Issuance of Stock:
Issuance of shares for options exercised		$ 1,853	191		2,044
Issuance of shares for options exercised (in shares)		69,342
Issuance of restricted stock & performance stock		$ 1,904	(1,904)
Issuance of restricted stock & performance stock (in shares)		71,816
Shares received in lieu of tax withholding payment on vested restricted stock		$ (1,509)			(1,509)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)		(19,989)
Stock-based compensation			1,749		1,749
Dividends				(4,178)	(4,178)
Share repurchase		$ (2,162)			(2,162)
Share repurchase (in shares)		(27,092)
BALANCE at Jun. 30, 2021	$ 411	$ (128,503)	326,179	553,925	752,012
BALANCE (in shares) at Jun. 30, 2021	41,123,365
BALANCE (in shares) at Jun. 30, 2021		(4,774,785)
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
BALANCE (in shares) at Mar. 31, 2022		(5,170,410)
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					$ 129,008
BALANCE at Jun. 30, 2022	$ 411	$ (183,024)	331,375	748,083	$ 896,845
BALANCE (in shares) at Jun. 30, 2022	41,123,365				41,123,365
BALANCE (in shares) at Jun. 30, 2022		(5,342,665)			5,342,665
BALANCE at Mar. 31, 2022	$ 411	$ (164,844)	331,978	710,863	$ 878,408
BALANCE (in shares) at Mar. 31, 2022	41,123,365
BALANCE (in shares) at Mar. 31, 2022		(5,170,410)
Increase (Decrease) in Stockholders' Equity
Net income				42,246	42,246
Issuance of Stock:
Issuance of restricted stock & performance stock		$ 2,425	(2,425)
Issuance of restricted stock & performance stock (in shares)		75,092
Shares received in lieu of tax withholding payment on vested restricted stock		$ (1,848)			(1,848)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)		(20,658)
Stock-based compensation			1,822		1,822
Dividends				(5,026)	(5,026)
Share repurchase		$ (18,757)			(18,757)
Share repurchase (in shares)		(226,689)
BALANCE at Jun. 30, 2022	$ 411	$ (183,024)	$ 331,375	$ 748,083	$ 896,845
BALANCE (in shares) at Jun. 30, 2022	41,123,365				41,123,365
BALANCE (in shares) at Jun. 30, 2022		(5,342,665)			5,342,665