Consolidated Statements Of Cash Flows Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Cash Flows Information [Abstract]
Interest	$ 119,463	$ 139,358	$ 127,623
Income taxes	34,479	(5,862)	(3,841)
Fair value of assets acquired in acquisition	37,486		17,911
Liabilities assumed in acquisition	(13,389)		(11,987)
Noncash investing and financing activities, total	$ 24,097		$ 5,924