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	16,318				16,318
Other comprehensive income, net of tax:
Pension liability adjustment	275							275
Foreign currency translation adjustment	(1,038)							(1,038)
Unrealized derivative loss on cash flow hedges	(1,309)							(1,309)
Cash flow hedges reclassified to earnings	0
Issuance of common shares, net of share withheld for taxes	(600)			(1,936)			1,336
Stock-based compensation	2,910		0	2,910	0		0	0
Ending balance at Sep. 30, 2019	138,675		111	49,014	131,275		(16,829)	(24,896)
Beginning balance at Jun. 30, 2019	136,221		111	48,159	128,211		(16,841)	(23,419)
Increase (Decrease) in Stockholders' Equity
Net income	3,064				3,064
Other comprehensive income, net of tax:
Pension liability adjustment	90							90
Foreign currency translation adjustment	(1,416)							(1,416)
Unrealized derivative loss on cash flow hedges	(151)							(151)
Cash flow hedges reclassified to earnings	0
Issuance of common shares, net of share withheld for taxes	(9)			(21)			12
Stock-based compensation	876			876
Ending balance at Sep. 30, 2019	138,675		111	49,014	131,275		(16,829)	(24,896)
Beginning balance at Dec. 31, 2019	169,862		111	49,204	157,525		(16,795)	(20,183)
Increase (Decrease) in Stockholders' Equity
Net income	5,487				5,487
Other comprehensive income, net of tax:
Pension liability adjustment	200							200
Foreign currency translation adjustment	(1,708)							(1,708)
Unrealized derivative loss on cash flow hedges	(809)							(809)
Cash flow hedges reclassified to earnings	137							137
Issuance of common shares, net of share withheld for taxes	(1,660)			(5,733)			4,073
Stock-based compensation	1,842		0	1,842	0		0	0
Ending balance at Sep. 30, 2020	173,351		111	45,313	163,012		(12,722)	(22,363)
Beginning balance at Jun. 30, 2020	163,896		111	44,709	156,182		(12,722)	(24,384)
Increase (Decrease) in Stockholders' Equity
Net income	6,830				6,830
Other comprehensive income, net of tax:
Pension liability adjustment	66							66
Foreign currency translation adjustment	1,818							1,818
Unrealized derivative loss on cash flow hedges	0
Cash flow hedges reclassified to earnings	137							137
Stock-based compensation	604			604
Ending balance at Sep. 30, 2020	$ 173,351		$ 111	$ 45,313	$ 163,012		$ (12,722)	$ (22,363)