CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock and Paid-in Capital	Common Stock	Unamortized Cost of Equity Awards	Retained Earnings	Foreign Currency Translation Adjustments	Accumulated income (loss) on derivatives	Defined Benefit Plan Liability	Total
Balances at Dec. 31, 2019	$ 37,136	$ 41,642	$ (4,506)	$ 92,589	$ (8,626)	$ (277)	$ (1,628)	$ 119,194
Balances (in shares) at Dec. 31, 2019		14,399
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	1,252	$ 1,252						1,252
Stock transactions under employee benefit stock plans (in shares)		48
Issuance of restricted stock, net of forfeitures	485	$ 3,574	(3,089)					485
Issuance of restricted stock, net of forfeitures (in shares)		156
Stock-based compensation expense	789		789					789
Shares withheld for payment of employee payroll taxes	(256)	$ (256)						(256)
Shares withheld for payment of employee payroll taxes (in shares)		(36)
Comprehensive (loss) income					(2,428)	(1,432)		(3,860)
Tax effect of derivative transactions						344		344
Net income				4,035				4,035
Dividends to stockholders				(290)				(290)
Balances at Mar. 31, 2020	39,406	$ 46,212	(6,806)	96,334	(11,054)	(1,365)	(1,628)	121,693
Balances (in shares) at Mar. 31, 2020		14,567
Balances at Dec. 31, 2019	37,136	$ 41,642	(4,506)	92,589	(8,626)	(277)	(1,628)	119,194
Balances (in shares) at Dec. 31, 2019		14,399
Increase (Decrease) in Stockholders' Equity
Net income								10,944
Balances at Sep. 30, 2020	40,674	$ 47,431	(6,757)	102,659	(5,689)	(1,624)	(1,628)	134,392
Balances (in shares) at Sep. 30, 2020		14,636
Balances at Mar. 31, 2020	39,406	$ 46,212	(6,806)	96,334	(11,054)	(1,365)	(1,628)	121,693
Balances (in shares) at Mar. 31, 2020		14,567
Increase (Decrease) in Stockholders' Equity
Issuance of restricted stock, net of forfeitures		$ 1,222	(1,222)
Issuance of restricted stock, net of forfeitures (in shares)		57
Stock-based compensation expense	921		921					921
Shares withheld for payment of employee payroll taxes	(541)	$ (541)						(541)
Shares withheld for payment of employee payroll taxes (in shares)		(8)
Comprehensive (loss) income					1,932	(433)		1,499
Tax effect of derivative transactions						104		104
Net income				2,896				2,896
Dividends to stockholders				(292)				(292)
Balances at Jun. 30, 2020	39,786	$ 46,893	(7,107)	98,938	(9,122)	(1,694)	(1,628)	126,280
Balances (in shares) at Jun. 30, 2020		14,617
Increase (Decrease) in Stockholders' Equity
Issuance of restricted stock, net of forfeitures		$ 555	(555)
Issuance of restricted stock, net of forfeitures (in shares)		21
Stock-based compensation expense	905		905					905
Shares withheld for payment of employee payroll taxes	(17)	$ (17)						(17)
Shares withheld for payment of employee payroll taxes (in shares)		(2)
Comprehensive (loss) income					3,433	91		3,524
Tax effect of derivative transactions						(21)		(21)
Net income				4,013				4,013
Dividends to stockholders				(292)				(292)
Balances at Sep. 30, 2020	40,674	$ 47,431	(6,757)	102,659	(5,689)	(1,624)	(1,628)	134,392
Balances (in shares) at Sep. 30, 2020		14,636
Balances at Dec. 31, 2020	41,278	$ 47,085	(5,807)	105,065	(216)	(1,438)	(1,633)	$ 143,056
Balances (in shares) at Dec. 31, 2020		14,632						14,632
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	988	$ 988						$ 988
Stock transactions under employee benefit stock plans (in shares)		32
Issuance of restricted stock, net of forfeitures	129	$ 3,001	(2,872)					129
Issuance of restricted stock, net of forfeitures (in shares)		81
Stock-based compensation expense	797		797					797
Shares withheld for payment of employee payroll taxes	(256)	$ (256)						(256)
Shares withheld for payment of employee payroll taxes (in shares)		(21)
Comprehensive (loss) income					(4,007)	929		(3,078)
Tax effect of derivative transactions						(221)		(221)
Net income				11,927				11,927
Dividends to stockholders				(294)				(294)
Balances at Mar. 31, 2021	42,936	$ 50,818	(7,882)	116,698	(4,223)	(730)	(1,633)	153,048
Balances (in shares) at Mar. 31, 2021		14,724
Balances at Dec. 31, 2020	41,278	$ 47,085	(5,807)	105,065	(216)	(1,438)	(1,633)	$ 143,056
Balances (in shares) at Dec. 31, 2020		14,632						14,632
Increase (Decrease) in Stockholders' Equity
Net income								$ 22,533
Balances at Sep. 30, 2021	43,792	$ 49,868	(6,076)	126,568	(5,796)	(519)	(1,633)	$ 162,412
Balances (in shares) at Sep. 30, 2021		14,715						14,715
Balances at Mar. 31, 2021	42,936	$ 50,818	(7,882)	116,698	(4,223)	(730)	(1,633)	$ 153,048
Balances (in shares) at Mar. 31, 2021		14,724
Increase (Decrease) in Stockholders' Equity
Issuance of restricted stock, net of forfeitures	(2)	$ 472	(474)					(2)
Issuance of restricted stock, net of forfeitures (in shares)		15
Stock-based compensation expense	1,000		1,000					1,000
Shares withheld for payment of employee payroll taxes	(1,344)	$ (1,344)						(1,344)
Shares withheld for payment of employee payroll taxes (in shares)		(23)
Comprehensive (loss) income					955	74		1,029
Tax effect of derivative transactions						(18)		(18)
Net income				4,634				4,634
Dividends to stockholders				(368)				(368)
Balances at Jun. 30, 2021	42,590	$ 49,946	(7,356)	120,964	(3,268)	(674)	(1,633)	157,979
Balances (in shares) at Jun. 30, 2021		14,716
Increase (Decrease) in Stockholders' Equity
Issuance of restricted stock, net of forfeitures	(1)	$ 22	(23)					(1)
Issuance of restricted stock, net of forfeitures (in shares)		1
Stock-based compensation expense	1,303		1,303					1,303
Shares withheld for payment of employee payroll taxes	(100)	$ (100)						(100)
Shares withheld for payment of employee payroll taxes (in shares)		(2)
Comprehensive (loss) income					(2,528)	203		(2,325)
Tax effect of derivative transactions						(48)		(48)
Net income				5,972				5,972
Dividends to stockholders				(368)				(368)
Balances at Sep. 30, 2021	$ 43,792	$ 49,868	$ (6,076)	$ 126,568	$ (5,796)	$ (519)	$ (1,633)	$ 162,412
Balances (in shares) at Sep. 30, 2021		14,715						14,715