Fair Value Measurements (Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (Contingent Consideration Liability, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Contingent Consideration Liability
Contingent consideration for acquisitions
Balance at beginning of period	$ (3,000)	$ (3,667)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments	0	691
Foreign currency translation adjustment	0	(24)
Balance at end of period	$ (3,000)	$ (3,000)