Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
(Provision) benefit for income taxes	$ (4,707,000)	$ 163,714,000	$ (3,540,000)	$ 143,469,000
Effective Income Tax Rate	8.20%	21.40%	3.10%	20.80%
Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%	35.00%
Debt RepurchasesTax Gain	71,700,000		141,500,000
Estimated Decrease in Deferred Tax Assets	(24,400,000)		(51,700,000)
Impairment charges	0	801,074,000	0	801,074,000
Reduction in Unrecognized Tax Benefits Resulting from Lapse of Applicable Statute of Limitations		28,200,000		28,200,000
Changes in Non-Deductible Goodwill
Change in Income Tax Expense (Benefit)		174,100,000		174,100,000
Effective Income Tax Rate Adjusted for Changes in Tax Items		(22.70%)		(25.20%)
Income Tax Reconciliation, Nondeductible Expense, Impairment Losses		457,200,000		457,200,000
Changes in Deferred Tax Liabilities
Change in Income Tax Expense (Benefit)		(72,500,000)		(78,900,000)
Effective Income Tax Rate Adjusted for Changes in Tax Items		9.50%		11.40%
Changes in Valuation Allowance
Change in Income Tax Expense (Benefit)	(17,100,000)	47,200,000	(42,700,000)	46,600,000
Effective Income Tax Rate Adjusted for Changes in Tax Items	(29.60%)	(6.20%)	(37.50%)	(6.80%)
Changes in Liabilities for Uncertain Tax Positions
Change in Income Tax Expense (Benefit)		$ (24,000,000)		$ (24,000,000)
Effective Income Tax Rate Adjusted for Changes in Tax Items		3.10%		3.50%