Condensed Consolidated Statements Of Stockholders' Equity (Unaudited) - 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
Increase (Decrease) in Stockholders' Equity
Adjustment to adopt ASU 2018-02		$ 0				$ 633			$ (633)
Beginning balance at Dec. 31, 2018	$ 122,119		$ 111	$ 48,040	$ 114,324		$ (18,165)	$ (22,191)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	13,254				13,254
Other comprehensive income, net of tax:
Pension liability adjustment	185							185
Foreign currency translation adjustment	378							378
Unrealized derivative loss on cash flow hedges	(1,158)							(1,158)
Issuance of common shares, net of share withheld for taxes	(591)			(1,915)			1,324
Stock-based compensation	2,034		0	2,034	0		0	0
Ending balance at Jun. 30, 2019	136,221		111	48,159	128,211		(16,841)	(23,419)
Beginning balance at Mar. 31, 2019	127,258		111	47,400	118,647		(17,196)	(21,704)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	9,564				9,564
Other comprehensive income, net of tax:
Pension liability adjustment	92							92
Foreign currency translation adjustment	(675)							(675)
Unrealized derivative loss on cash flow hedges	(1,132)							(1,132)
Issuance of common shares, net of share withheld for taxes	(65)			(420)			355
Stock-based compensation	1,179			1,179
Ending balance at Jun. 30, 2019	136,221		111	48,159	128,211		(16,841)	(23,419)
Beginning balance at Dec. 31, 2019	169,862		111	49,204	157,525		(16,795)	(20,183)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(1,343)				(1,343)
Other comprehensive income, net of tax:
Pension liability adjustment	134							134
Foreign currency translation adjustment	(3,526)							(3,526)
Unrealized derivative loss on cash flow hedges	(809)							(809)
Issuance of common shares, net of share withheld for taxes	(1,660)			(5,733)			4,073
Stock-based compensation	1,238		0	1,238	0		0	0
Ending balance at Jun. 30, 2020	163,896		111	44,709	156,182		(12,722)	(24,384)
Beginning balance at Mar. 31, 2020	162,506		111	44,328	155,659		(12,896)	(24,696)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	523				523
Other comprehensive income, net of tax:
Pension liability adjustment	76							76
Foreign currency translation adjustment	181							181
Unrealized derivative loss on cash flow hedges	55							55
Issuance of common shares, net of share withheld for taxes	(3)			(177)			174
Stock-based compensation	558			558
Ending balance at Jun. 30, 2020	$ 163,896		$ 111	$ 44,709	$ 156,182		$ (12,722)	$ (24,384)