Financial Instruments Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 2,660	$ 1,559
Available-for-sale securities	37,915	41,178
Interest rate swaps - asset	152	711
Foreign exchange contracts - asset	4,685	2,625
Foreign exchange contracts - liability	(3,444)	(3,363)
Contingent consideration	(4,027)	(3,889)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	37,941	38,821
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	2,660	1,559
Available-for-sale securities	37,915	41,178
Interest rate swaps - asset	0	0
Foreign exchange contracts - asset	0	0
Foreign exchange contracts - liability	0	0
Contingent consideration	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	40,575	42,737
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Available-for-sale securities	0	0
Interest rate swaps - asset	152	711
Foreign exchange contracts - asset	4,685	2,625
Foreign exchange contracts - liability	(3,444)	(3,363)
Contingent consideration	0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis	1,393	(27)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Available-for-sale securities	0	0
Interest rate swaps - asset	0	0
Foreign exchange contracts - asset	0	0
Foreign exchange contracts - liability	0	0
Contingent consideration	(4,027)	(3,889)
Total Fair Value Assets And Liabilities Measured On Recurring Basis	$ (4,027)	$ (3,889)