Income Taxes (Components Of Income (Loss) Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit) [Abstract]
Domestic	$ 586,631	$ 404,422	$ 339,382
Foreign	(1,462)	(2,990)	3,578
Income before income taxes	$ 585,169	$ 401,432	$ 342,960