CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Unamortized Cost of Equity Awards	Retained Earnings	Foreign Currency Translation Adjustment	Accumulated income (loss) on derivatives	Defined Benefit Plan Liability	Total
Balances at Dec. 31, 2017	$ 34,473	$ (3,422)	$ 61,882	$ (4,837)	$ 196	$ (945)	$ 87,347
Balances (in shares) at Dec. 31, 2017	9,427
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	$ 852						852
Stock transactions under employee benefit stock plans (in shares)	26
Issuance of restricted stock, net of forfeitures	$ 3,033	(1,859)					1,174
Issuance of restricted stock, net of forfeitures (in shares)	92
Stock compensation expense		2,115					2,115
Shares withheld for payment of employee payroll taxes	$ (1,579)						(1,579)
Shares withheld for payment of employee payroll taxes (in shares)	(60)
Comprehensive income (loss)				(3,109)	370	(63)	(2,802)
Tax effect					(132)	2	(130)
Net income			15,925				15,925
Dividends to stockholders			(1,089)				(1,089)
Balances at Dec. 31, 2018	$ 36,779	(3,166)	76,718	(7,946)	434	(1,006)	101,813
Balances (in shares) at Dec. 31, 2018	9,485
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	$ 1,089						1,089
Stock transactions under employee benefit stock plans (in shares)	27
Issuance of restricted stock, net of forfeitures	$ 4,520	(4,191)					329
Issuance of restricted stock, net of forfeitures (in shares)	107
Stock compensation expense		2,851					2,851
Shares withheld for payment of employee payroll taxes	$ (746)						(746)
Shares withheld for payment of employee payroll taxes (in shares)	(20)
Comprehensive income (loss)				(680)	(929)	(808)	(2,417)
Tax effect					218	186	404
Net income			17,022				17,022
Dividends to stockholders			(1,151)				(1,151)
Balances at Dec. 31, 2019	$ 41,642	(4,506)	92,589	(8,626)	(277)	(1,628)	$ 119,194
Balances (in shares) at Dec. 31, 2019	9,599						9,599
Increase (Decrease) in Stockholders' Equity
Stock transactions under employee benefit stock plans	$ 1,252						$ 1,252
Stock transactions under employee benefit stock plans (in shares)	32
Issuance of restricted stock, net of forfeitures	$ 5,223	(4,851)					372
Issuance of restricted stock, net of forfeitures (in shares)	154
Stock compensation expense		3,550					3,550
Shares withheld for payment of employee payroll taxes	$ (1,032)						(1,032)
Shares withheld for payment of employee payroll taxes (in shares)	(31)
Comprehensive income (loss)				8,410	(1,526)	(5)	6,879
Tax effect					365		365
Net income			13,643				13,643
Dividends to stockholders			(1,167)				(1,167)
Balances at Dec. 31, 2020	$ 47,085	$ (5,807)	$ 105,065	$ (216)	$ (1,438)	$ (1,633)	$ 143,056
Balances (in shares) at Dec. 31, 2020	9,754						9,754