Consolidated Statements of Stockholders Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2017	$ 154,496	$ (305)	$ 111	$ 45,017	$ 145,797	$ (305)	$ (18,662)	$ (17,767)	$ 0
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(31,168)				(31,168)
Other comprehensive (loss) income, net of tax:
Pension liability adjustment	(472)							(472)
Foreign currency translation adjustment	(4,405)							(4,405)
Unrealized derivative gain on cash flow hedges	453							453
Cash flow hedges reclassified to earnings	0
Issuance of common shares net of shares withheld for taxes	(316)			(813)			497
Stock-based compensation	3,836			3,836
Ending balance at Dec. 31, 2018	$ 122,119		111	48,040	114,324	$ 633	(18,165)	(22,191)	$ (633)
Other comprehensive (loss) income, net of tax:
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201802Member
Net income (loss)	$ 42,568				42,568
Pension liability adjustment	1,467							1,467
Foreign currency translation adjustment	2,033							2,033
Unrealized derivative gain on cash flow hedges	(859)							(859)
Cash flow hedges reclassified to earnings	0
Issuance of common shares net of shares withheld for taxes	(621)			(1,991)			1,370
Stock-based compensation	3,155			3,155
Ending balance at Dec. 31, 2019	169,862		111	49,204	157,525		(16,795)	(20,183)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	7,582				7,582
Other comprehensive (loss) income, net of tax:
Pension liability adjustment	(1,049)							(1,049)
Foreign currency translation adjustment	1,500							1,500
Unrealized derivative gain on cash flow hedges	(809)							(809)
Cash flow hedges reclassified to earnings	273							273
Issuance of common shares net of shares withheld for taxes	(1,665)			(5,757)			4,092
Stock-based compensation	1,136			1,136
Ending balance at Dec. 31, 2020	$ 176,830		$ 111	$ 44,583	$ 165,107		$ (12,703)	$ (20,268)