Condensed Consolidated Statement of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Interest Rate Cap	Interest Rate Cap AOCI Attributable to Parent [Member]	Interest Rate Swap [Member]	Interest Rate Swap [Member] AOCI Attributable to Parent [Member]
Beginning balance at Dec. 31, 2017	$ 188,054	$ 172	$ 107,256	$ 106,599	$ (11,118)	$ (14,855)
Net income	9,451			9,451
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments							$ 252	$ 252	$ 47	$ 47
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(3,662)					(3,662)
Stock Repurchased During Period, Value	(7,956)				(7,956)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,344		1,344
Stock Issued During Period, Value, Defined Contribution Plan Employer Discretionary Contribution	2,157		(298)		2,455
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(93)		(1,002)		909
Ending balance at Sep. 30, 2018	189,198	172	107,300	115,654	(15,710)	(18,218)
Beginning balance at Jun. 30, 2018	186,084	172	107,372	112,410	(16,074)	(17,796)
Net income	3,244			3,244
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments							$ 47	$ 47	$ (12)	$ (12)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(457)					(457)
Stock Repurchased During Period, Value	(662)				(662)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	247		247
Stock Issued During Period, Value, Defined Contribution Plan Employer Discretionary Contribution	720		(210)		930
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(13)		(109)		96
Ending balance at Sep. 30, 2018	189,198	172	107,300	115,654	(15,710)	(18,218)
Beginning balance at Dec. 31, 2018	186,569	172	105,850	116,039	(13,802)	(21,690)
Net income	5,694			5,694
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2,118)					(2,118)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	1,739		1,739
Adjustments To Additional Paid In Capital Share Based Compensation Employer Contributions To Retirement Plan	2,200		(1,546)		3,746
Stockholders' Equity, Other	959		(3,052)		4,011
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(2,118)
Ending balance at Sep. 30, 2019	195,043	172	102,991	121,733	(6,045)	(23,808)
Beginning balance at Jun. 30, 2019	193,764
Net income	2,141
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(3,451)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	783
Adjustments To Additional Paid In Capital Share Based Compensation Employer Contributions To Retirement Plan	737
Stockholders' Equity, Other	1,069
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(3,451)
Ending balance at Sep. 30, 2019	$ 195,043	$ 172	$ 102,991	$ 121,733	$ (6,045)	$ (23,808)