Financial Instruments Measured at Fair Value Financial Instruments Measured at Fair Value - Unobservable Inputs Reconciliation (Details) (Fair Value, Inputs, Level 3 [Member], Fair Value, Measurements, Recurring [Member], Contingent Consideration [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of December 31, 2013	$ (5,845)
Fair value of initial contingent consideration	(5,853)
Change in fair value of contingent consideration included in earnings	2,976
Balance as of December 31, 2014	(6,202)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	1,499
contingent consideration, translation adjustment	$ 1,021