Fair Value of Financial Instruments (Fair Value for Level 3 Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value of Financial Instruments [Abstract]
Beginning balance	$ 70,165	$ 55,550
Contingent consideration recorded at acquisition date	815	42,538
Payment of contingent consideration recorded at acquisition date	(2,190)	(24,847)
Payment of contingent consideration recorded in earnings		(1,074)
Adjustments to contingent considerations	(22,180)	(3,450)
Interest accretion expense	2,784	1,448
Ending balance	$ 49,394	$ 70,165