Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Assets and liabilities measured at fair value [Abstract]
Money market fund	$ 10,355	$ 8,979
Foreign exchange contracts - Assets	39	121
Total assets	10,394	9,100
Foreign exchange contracts - Liabilities	159	57
Contingent consideration liability	2,242	3,732
Total liabilities	2,401	3,789
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	3,732
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	1,421
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	69
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease), Total	(1,490)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	2,242
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market fund	10,355	8,979
Foreign exchange contracts - Assets	0	0
Total assets	10,355	8,979
Foreign exchange contracts - Liabilities	0	0
Contingent consideration liability	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market fund	0	0
Foreign exchange contracts - Assets	39	121
Total assets	39	121
Foreign exchange contracts - Liabilities	159	57
Contingent consideration liability	0	0
Total liabilities	159	57
Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value [Abstract]
Money market fund	0	0
Foreign exchange contracts - Assets	0	0
Total assets	0	0
Foreign exchange contracts - Liabilities	0	0
Contingent consideration liability	2,242	3,732
Total liabilities	$ 2,242	$ 3,732