Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - Contingent Consideration Liability [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Contingent consideration for acquisitions
Balance at beginning of period	$ (3,000)	$ (3,667)
Additions for acquisitions	(13,814)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	691
Fair value adjustment	(4,167)	0
Foreign currency translation adjustment	0	(24)
Balance at end of period	$ (20,981)	$ (3,000)