Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Contingent consideration for acquisitions
Balance at beginning of period	$ (3,000)	$ (3,000)	$ (3,000)	$ (3,667)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	(17,100)	0	17,100	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	0	0	(691)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	512	0	512	0
Foreign currency translation adjustment	0	0	0	(24)
Balance at end of period	$ (20,612)	$ (3,000)	$ (20,612)	$ (3,000)