CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Treasury - Common Stock	Additional Paid-in Capital [Member]	Accumulated Income [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance at Dec. 31, 2019	$ 40		$ 96,109		$ 179,440		$ (13,295)		$ 262,294
Balance (in shares) at Dec. 31, 2019	40,207
Change in Stockholders' Equity
Net loss					4				4
Foreign currency translation adjustment, net of tax							(4,278)		(4,278)
Restricted stock awards			1,350						1,350
Restricted stock awards, Shares	168
Tax payments for stock issuances			(293)						(293)
Tax payments for stock issuances, Shares	(61)
Pension adjustment, net of tax							(6)		(6)
Balance at Mar. 31, 2020				$ (253)		$ 0		$ (253)
Balance at Mar. 31, 2020	$ 40		97,166		179,191		(17,579)		258,818
Balance (in shares) at Mar. 31, 2020	40,314
Balance at Dec. 31, 2019	$ 40		96,109		179,440		(13,295)		262,294
Balance (in shares) at Dec. 31, 2019	40,207
Change in Stockholders' Equity
Net loss									(3,699)
Balance at Sep. 30, 2020	$ 40		97,378		175,488		(13,690)		259,216
Balance (in shares) at Sep. 30, 2020	40,356
Balance at Mar. 31, 2020	$ 40		97,166		179,191		(17,579)		258,818
Balance (in shares) at Mar. 31, 2020	40,314
Change in Stockholders' Equity
Net loss					(2,025)				(2,025)
Foreign currency translation adjustment, net of tax							446		446
Restricted stock awards			860						860
Restricted stock awards, Shares	19
Tax payments for stock issuances			(886)						(886)
Tax payments for stock issuances, Shares	(4)
Pension adjustment, net of tax							(6)		(6)
Balance at Jun. 30, 2020	$ 40		97,140		177,166		(17,139)		257,207
Balance (in shares) at Jun. 30, 2020	40,329
Change in Stockholders' Equity
Net loss					(1,678)				(1,678)
Foreign currency translation adjustment, net of tax							3,455		3,455
Restricted stock awards			1,022						1,022
Restricted stock awards, Shares	55
Tax payments for stock issuances			(784)						(784)
Tax payments for stock issuances, Shares	(28)
Pension adjustment, net of tax							(6)		(6)
Balance at Sep. 30, 2020	$ 40		97,378		175,488		(13,690)		259,216
Balance (in shares) at Sep. 30, 2020	40,356
Balance at Dec. 31, 2020	$ 40	$ (5,030)	98,819		173,731		(10,220)		257,340
Balance (in shares) at Dec. 31, 2020	40,103	250
Change in Stockholders' Equity
Net loss					(9,151)				(9,151)
Foreign currency translation adjustment, net of tax					22		(919)		(897)
Restricted stock awards			1,342						1,342
Restricted stock awards, Shares	248
Tax payments for stock issuances			(2,139)						(2,139)
Tax payments for stock issuances, Shares	(86)
Unrealized losses on available-for-sale securities							(15)		(15)
Balance at Mar. 31, 2021	$ 40	$ (5,030)	98,022		164,602		(11,154)		246,480
Balance (in shares) at Mar. 31, 2021	40,265	250
Balance at Dec. 31, 2020	$ 40	$ (5,030)	98,819		173,731		(10,220)		257,340
Balance (in shares) at Dec. 31, 2020	40,103	250
Change in Stockholders' Equity
Net loss									(16,811)
Unrealized losses on available-for-sale securities									7
Balance at Sep. 30, 2021	$ 40	$ (12,501)	99,018		156,946		(12,884)		230,619
Balance (in shares) at Sep. 30, 2021	39,966	592
Balance at Mar. 31, 2021	$ 40	$ (5,030)	98,022		164,602		(11,154)		246,480
Balance (in shares) at Mar. 31, 2021	40,265	250
Change in Stockholders' Equity
Net loss					(6,685)				(6,685)
Foreign currency translation adjustment, net of tax							549		549
Restricted stock awards			1,292						1,292
Restricted stock awards, Shares	24
Tax payments for stock issuances			(91)						(91)
Tax payments for stock issuances, Shares	(7)
Share repurchase		$ (2,908)							(2,908)
Share repurchased (in shares)	(111)	111
Unrealized losses on available-for-sale securities							8		8
Balance at Jun. 30, 2021	$ 40	$ (7,938)	99,223		157,917		(10,597)		238,645
Balance (in shares) at Jun. 30, 2021	40,171	361
Change in Stockholders' Equity
Net loss					(975)				(975)
Foreign currency translation adjustment, net of tax					4		(2,287)		(2,283)
Restricted stock awards	$ 57		347						347
Tax payments for stock issuances	$ (31)		(552)						(552)
Share repurchase		$ (4,563)							(4,563)
Share repurchased (in shares)	(231)	231
Balance at Sep. 30, 2021	$ 40	$ (12,501)	$ 99,018		$ 156,946		$ (12,884)		$ 230,619
Balance (in shares) at Sep. 30, 2021	39,966	592