Goodwill And Intangible Assets (Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets
Balance, beginning of period	$ 1,675,235	$ 1,240,422	$ 1,652,002	$ 1,229,298
Goodwill acquired, including post acquisition adjustments	62,895	10,029	88,248	21,940
Disposals	(98)	0	(2,218)	(787)
Balance, end of period	$ 1,738,032	$ 1,250,451	$ 1,738,032	$ 1,250,451