Fair Value of Financial Instruments (Fair Value for Level 3 Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value of Financial Instruments [Abstract]
Beginning balance	$ 49,394	$ 70,165
Contingent consideration recorded at acquisition date	20,389	815
Payment of contingent consideration recorded at acquisition date	(16,322)	(2,190)
Payment of contingent consideration recorded in earnings	(493)
Adjustments to contingent consideration	(2,623)	(22,180)	$ (3,450)
Interest accretion expense	1,481	2,784
Ending balance	$ 51,826	$ 49,394	$ 70,165