Consolidated Statements of Stockholders Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2017	$ 154,496	$ 111	$ 45,017	$ 145,797	$ (18,662)	$ (17,767)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(31,168)			(31,168)
Other comprehensive income (loss), 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
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	(18,165)	(22,191)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	42,568			42,568
Other comprehensive income (loss), net of tax:
Pension liability adjustment	1,467					1,467
Foreign currency translation adjustment	2,033					2,033
Unrealized derivative gain on cash flow hedges	(859)					(859)
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)