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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended
Sep. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Maximum [Member]
Income Tax Contingency [Line Items]          
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 2,100,000,000        
Deferred tax assets, net   2,034,668,000 2,086,754,000    
Gross unrecognized tax benefits   173,300,000      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   34,400,000      
Possible decrease in unrecognized tax benefits   $ 141,500,000      
Income Tax Examination, Year under Examination       2004 2014