Acquisitions (Fair Value Of Total Consideration Transferred And Major Class Of Consideration) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Goodwill	$ 1,738,032	$ 1,675,235	$ 1,652,002	$ 1,250,451	$ 1,240,422	$ 1,229,298
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable	3,082			323
Supplies, inventory, prepaid and other current assets	1,801			143
Property and equipment	5,357			1,203
Goodwill	91,545			21,940
Other intangible assets	0			150
Accounts payable	(1,482)			(104)
Other accrued liabilities	(416)			(137)
Long-term debt	(2,561)			0
Total fair value	97,326			23,518
Less: Fair value attributable to noncontrolling interests	38,123			9,250
Acquisition date fair value of total consideration transferred	$ 59,203			$ 14,268