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	6,207			6,207
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments							$ 205	$ 205	$ 59	$ 59
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(3,205)					(3,205)
Stock Repurchased During Period, Value	(7,294)				(7,294)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,097		1,097
Stock Issued During Period, Value, Defined Contribution Plan Employer Discretionary Contribution	1,437		(88)		1,525
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(80)		(893)		813
Ending balance at Jun. 30, 2018	186,084	172	107,372	112,410	(16,074)	(17,796)
Beginning balance at Mar. 31, 2018	187,022	172	107,369	108,835	(17,134)	(12,220)
Net income	3,575			3,575
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments							$ 57	$ 57	$ 4	$ 4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(5,637)					(5,637)
Stock Repurchased During Period, Value	(33)				(33)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	399		399
Stock Issued During Period, Value, Defined Contribution Plan Employer Discretionary Contribution	726		(92)		818
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(29)		(304)		275
Ending balance at Jun. 30, 2018	186,084	172	107,372	112,410	(16,074)	(17,796)
Beginning balance at Dec. 31, 2018	186,569	172	105,850	116,039	(13,802)	(21,690)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax						(380)
Ending balance at Mar. 31, 2019	189,714	172	104,909	116,373	(11,763)	(19,977)
Beginning balance at Dec. 31, 2018	186,569	172	105,850	116,039	(13,802)	(21,690)
Net income	3,553			3,553
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,333					1,333
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	956		956
Adjustments To Additional Paid In Capital Share Based Compensation Employer Contributions To Retirement Plan	1,463		(961)		2,424
Stockholders' Equity, Other	(110)		(1,658)		1,548
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	1,333
Ending balance at Jun. 30, 2019	193,764	172	104,187	119,592	(9,830)	(20,357)
Beginning balance at Mar. 31, 2019	189,714	172	104,909	116,373	(11,763)	(19,977)
Net income	3,219			3,219
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(380)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	602		602
Adjustments To Additional Paid In Capital Share Based Compensation Employer Contributions To Retirement Plan	728		(540)		1,268
Stockholders' Equity, Other	(119)		(784)		665
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(380)
Ending balance at Jun. 30, 2019	$ 193,764	$ 172	$ 104,187	$ 119,592	$ (9,830)	$ (20,357)