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Subsequent Event (Narrative) (Details) (USD $)
 0 Months Ended 0 Months Ended
Oct. 24, 2013
Oct. 22, 2013
Aug. 26, 2013
Sep. 30, 2013
September 2015 Notes [Member]
Dec. 31, 2012
September 2015 Notes [Member]
Sep. 30, 2013
December 2029 Notes [Member]
Dec. 31, 2012
December 2029 Notes [Member]
Sep. 30, 2010
2015 Notes Hedges [Member]
Oct. 22, 2013
Subsequent Event [Member]
Oct. 24, 2013
Subsequent Event [Member]
September 2015 Notes [Member]
Oct. 24, 2013
Subsequent Event [Member]
December 2029 Notes [Member]
Oct. 22, 2013
Subsequent Event [Member]
2015 Notes Hedges [Member]
counterparties
Subsequent Event [Line Items]                        
Percentage of outstanding call options and warrants settled pursuant to agreement   50.00% 50.00%           50.00%      
Net cash received from counterparties for settlement of call options and warrants                 $ 20,300,000      
Warrants outstanding after settlement                 8,100,000      
Warrants, strike price                 $ 15.81      
Number of counterparties remaining under outstanding call options                       2
Derivative, conversion spread, shares               16,000,000       8,100,000
Derivative, asset, strike price               $ 12.50       $ 12.35
Extinguishment of debt, amount                   72,300,000 29,600,000  
Extinguishment of debt, cash paid 127,600,000                 83,200,000 44,400,000  
Extinguishment of debt, cash paid for shares of common stock                   44,500,000 22,300,000  
Extinguishment of debt, shares issued                   2,079,295 1,039,485  
Convertible debt, carrying value       183,580,000 178,056,000 107,872,000 103,570,000     66,600,000 27,700,000  
Extinguishment of debt, gain (loss), net of tax                   $ (8,100,000) $ (3,300,000)