Income Taxes (Jurisdictional Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Gross, asset	$ 232,444	$ 216,240
Valuation allowance, asset	(70,940)	(228,417)
Net, asset	2,643,316	1,392,743
Net, liability	(2,481,812)	(1,404,920)
Net deferred income tax assets (liabilities)	161,504	(12,177)
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Gross, asset	104,213	33,103
Valuation allowance, asset	(29,402)	(55,980)
Net deferred income tax assets (liabilities)	74,811	(22,877)
State [Member]
Operating Loss Carryforwards [Line Items]
Gross, asset	35,474	45,813
Valuation allowance, asset	(41,538)	(34,156)
Net deferred income tax assets (liabilities)	(6,064)	11,657
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Gross, asset	41,377	63,110
Valuation allowance, asset	0	(64,067)
Net deferred income tax assets (liabilities)	41,377	(957)
Other Comprehensive Income (Loss) [Member]
Operating Loss Carryforwards [Line Items]
Gross, asset	51,380	74,214
Valuation allowance, asset	0	(74,214)
Net deferred income tax assets (liabilities)	$ 51,380	$ 0