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	3,576			3,576
Other comprehensive loss, net of tax:
Pension liability adjustment	255					255
Foreign currency translation adjustment	(2,761)					(2,761)
Unrealized derivative gain on cash flow hedges	1,036					1,036
Issuance of common shares, net of shares withheld for taxes	(310)		(792)		482
Stock-based compensation	1,904		1,904
Ending balance at Jun. 30, 2018	157,891	111	46,129	149,068	(18,180)	(19,237)
Beginning balance at Mar. 31, 2018	153,981	111	45,307	143,634	(18,180)	(16,891)
Increase (Decrease) in Stockholders' Equity
Net income	5,434			5,434
Other comprehensive loss, net of tax:
Pension liability adjustment	141					141
Foreign currency translation adjustment	(2,785)					(2,785)
Unrealized derivative gain on cash flow hedges	298					298
Stock-based compensation	822		822
Ending balance at Jun. 30, 2018	157,891	111	46,129	149,068	(18,180)	(19,237)
Beginning balance at Dec. 31, 2018	122,119	111	48,040	114,324	(18,165)	(22,191)
Increase (Decrease) in Stockholders' Equity
Net income	13,254			13,254
Other comprehensive loss, net of tax:
Pension liability adjustment	185					185
Foreign currency translation adjustment	378					378
Unrealized derivative gain on cash flow hedges	(1,158)					(1,158)
Issuance of common shares, net of shares withheld for taxes	(591)		(1,915)		1,324
Stock-based compensation	2,034		2,034
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	9,564			9,564
Other comprehensive loss, net of tax:
Pension liability adjustment	92					92
Foreign currency translation adjustment	(675)					(675)
Unrealized derivative gain on cash flow hedges	(1,132)					(1,132)
Issuance of common shares, net of shares 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)