Fair Value Measurements (Fair Value for Level 3 Liabilities) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Fair Value [Abstract]
Beginning balance	$ 70,165	$ 55,550
Contingent consideration recorded at acquisition date	515	4,814
Payment of contingent consideration recorded at acquisition date	(190)	(470)
Payment of contingent consideration recorded in earnings		(450)
Adjustments to contingent considerations	(19,809)	(2,813)
Interest accretion expense	2,428	1,022
Ending balance	$ 53,109	$ 57,653