Segment And Geographic Information (Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment And Geographic Information [Abstract]
Income from operations for reportable segments	$ 50,459	$ 117,331	$ 138,369	$ 140,637	$ 137,052	$ 107,346	$ 99,537	$ 34,429	$ 446,796	$ 378,364	$ 107,257
Interest expense									(50,992)	(39,875)	(34,957)
Other income, (expense), net									5,628	4,471	6,453
Income before income taxes									$ 401,432	$ 342,960	$ 78,753