Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Valuation allowance adjustment	$ 73,700,000	$ 2,100,000,000
Gross federal NOL carryforward	2,100,000,000		2,100,000,000
Section 382 limitation amount per year			67,400,000
Section 382 limitation period			60 months
Gross unrecognized tax benefits	173,310,000		173,310,000	170,425,000	171,863,000	258,016,000
Unrecognized tax benefits that would impact effective tax rate	21,500,000		21,500,000	166,300,000
Possible decrease in unrecognized tax benefits	128,200,000		128,200,000
Unrecognized tax benefits, income tax penalties and interest accrued	33,100,000		33,100,000	31,500,000
Unrecognized tax benefits, income tax penalties and interest expense			$ (3,000,000)	$ 5,400,000
Minimum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiration dates			Jan. 01, 2014
Income tax examination, year(s) under examination			2003
Maximum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, expiration dates			Jan. 01, 2033
Income tax examination, year(s) under examination			2013