Condensed 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	9,984			9,984
Other comprehensive loss, net of tax:
Pension liability adjustment	392					392
Foreign currency translation adjustment	(3,132)					(3,132)
Unrealized derivative gain on cash flow hedges	1,243					1,243
Issuance of common shares, net of shares withheld for taxes	(316)		(813)		497
Stock-based compensation	2,838		2,838
Ending balance at Sep. 30, 2018	165,200	111	47,042	155,476	(18,165)	(19,264)
Beginning balance at Jun. 30, 2018	157,891	111	46,129	149,068	(18,180)	(19,237)
Increase (Decrease) in Stockholders' Equity
Net income	6,408			6,408
Other comprehensive loss, net of tax:
Pension liability adjustment	137					137
Foreign currency translation adjustment	(371)					(371)
Unrealized derivative gain on cash flow hedges	207					207
Issuance of common shares, net of shares withheld for taxes	(6)		(21)		15
Stock-based compensation	934		934
Ending balance at Sep. 30, 2018	165,200	111	47,042	155,476	(18,165)	(19,264)
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 loss, net of tax:
Pension liability adjustment	275					275
Foreign currency translation adjustment	(1,038)					(1,038)
Unrealized derivative gain on cash flow hedges	(1,309)					(1,309)
Issuance of common shares, net of shares withheld for taxes	(600)		(1,936)		1,336
Stock-based compensation	2,910		2,910
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 loss, net of tax:
Pension liability adjustment	90					90
Foreign currency translation adjustment	(1,416)					(1,416)
Unrealized derivative gain on cash flow hedges	(151)					(151)
Issuance of common shares, net of shares 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)