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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Income from operations for reportable segments	$ 257,580	$ 266,602	$ 235,227	$ 194,055	$ 156,231	$ 142,517	$ 170,978	$ 145,625	$ 953,464	$ 615,351	$ 446,796
Interest expense									(18,082)	(43,049)	(50,992)
Debt retirement costs									0	(7,082)	0
Gain from sales of equity securities									0	16,429	0
Other income, (expense), net									6,790	3,520	5,628
Income (Loss) from Continuing Operations before Income Taxes									$ 942,172	$ 585,169	$ 401,432