Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 4,408,138	$ 4,264,845
Goodwill acquired as part of acquisitions during current year	36,245	141,277
Consideration and purchase price allocation adjustments for prior year's acquisitions and other adjustments	(248)	2,016
Goodwill, Ending Balance	$ 4,444,135	$ 4,408,138