Intangible Assets and Goodwill (Schedule of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 5,047,885
Change in goodwill associated with prior acquisition	1,436
Goodwill, ending balance	$ 5,049,321