CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings (Deficit)	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings (Deficit)	Total
BALANCE at Dec. 31, 2018			$ 411	$ (87,747)	$ 316,479	$ 268,904	$ 498,047
BALANCE (in shares) at Dec. 31, 2018			41,123,365
BALANCE (in shares) at Dec. 31, 2018				(4,229,653)
Increase (Decrease) in Stockholders' Equity
Net income						114,324	114,324
Issuance of Stock:
Issuance of shares for options exercised				$ 2,532	(182)		2,350
Issuance of shares for options exercised (in shares)				114,125
Issuance of restricted stock & performance stock				$ 2,303	(297)		2,006
Issuance of restricted stock & performance stock (in shares)				107,606
Shares received in lieu of tax withholding payment on vested restricted stock				$ (1,498)			(1,498)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)				28,586
Stock-based compensation					4,168		4,168
Dividends						(14,543)	(14,543)
Share repurchase				$ (19,550)			(19,550)
Share repurchase (in shares)				428,940
BALANCE at Dec. 31, 2019			$ 411	$ (103,960)	320,168	368,685	585,304
BALANCE (in shares) at Dec. 31, 2019			41,123,365
BALANCE (in shares) at Dec. 31, 2019				(4,465,448)
Increase (Decrease) in Stockholders' Equity
Net income						150,139	150,139
Issuance of Stock:
Issuance of shares for options exercised				$ 2,811	(667)		2,144
Issuance of shares for options exercised (in shares)				113,731
Issuance of restricted stock & performance stock				$ 3,102	(1,247)		1,855
Issuance of restricted stock & performance stock (in shares)				128,889
Shares received in lieu of tax withholding payment on vested restricted stock				$ (1,076)			(1,076)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)				27,724
Stock-based compensation					4,197		4,197
Dividends						(15,499)	(15,499)
Share repurchase				$ (30,120)			(30,120)
Share repurchase (in shares)				684,634
BALANCE at Dec. 31, 2020	$ (515)	$ (515)	$ 411	$ (129,243)	322,451	502,810	$ 696,429
BALANCE (in shares) at Dec. 31, 2020			41,123,365				41,123,365
BALANCE (in shares) at Dec. 31, 2020				(4,935,186)			4,935,186
Increase (Decrease) in Stockholders' Equity
Net income						143,348	$ 143,348
Issuance of Stock:
Issuance of shares for options exercised				$ 5,399	235		5,634
Issuance of shares for options exercised (in shares)				195,724
Issuance of restricted stock & performance stock				$ 2,681	(473)		2,208
Issuance of restricted stock & performance stock (in shares)				101,360
Shares received in lieu of tax withholding payment on vested restricted stock				$ (2,363)			(2,363)
Shares received in lieu of tax withholding payment on vested restricted stock (in shares)				31,413
Stock-based compensation					4,848		4,848
Dividends						(17,384)	(17,384)
Share repurchase				$ (27,054)			(27,054)
Share repurchase (in shares)				362,796
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