Income Taxes (Reconciliation Of The Beginning And Ending Amount Of The Valuation Allowance Recorded Against Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Income Tax Disclosure [Abstract]
Beginning balance			$ 821,429			$ 774,961
Increase / (decrease) in valuation allowance	(13,331)	(16,859)	(4,181)	(11,725)	9,723	43,906
Ending balance	$ 787,058			$ 816,865