Fair Value Measurements (Fair Value for Level 3 Liabilities) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 69,484	$ 54,615
Contingent consideration recorded at acquisition date	3,327	398
Payment of contingent consideration recorded at acquisition date	(2,251)	(550)
Adjustments to contingent consideration	16,794	1,466
Interest accretion expense	841	919
Ending balance	88,014	57,000
Foreign Currency Translation Adjustment [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Foreign currency translation adjustment	$ (181)	$ 152