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Notes Payable and Amounts Due Under Repurchase Agreements (2015 Notes, 2015 Notes Hedges and 2015 Warrants Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
counterparties
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Convertible Debt [Member]
Dec. 31, 2012
Convertible Debt [Member]
Dec. 31, 2011
Convertible Debt [Member]
Dec. 31, 2013
2015 Notes Embedded Derivative [Member]
Dec. 31, 2012
2015 Notes Embedded Derivative [Member]
Dec. 31, 2013
2015 Notes Hedges [Member]
Sep. 30, 2010
2015 Notes Hedges [Member]
Dec. 31, 2013
September 2015 Notes [Member]
Dec. 31, 2012
September 2015 Notes [Member]
Dec. 31, 2010
September 2015 Notes [Member]
Sep. 30, 2010
September 2015 Notes [Member]
Debt Instrument [Line Items]                            
Interest rate, stated percentage                     3.50%      
Principal amount of convertible senior notes payable at issuance                           $ 200,000,000
Deferred financing costs                     6,800,000      
Debt instrument, number of days holders may convert                     5 days      
Debt instrument, measurement period of convertible senior notes                     10 days      
Debt instrument, face amount                     1,000      
Product of last reported common stock sale price and conversion rate                     98.00%      
Debt instrument, number of days to measure stock value against conversion value                     20 days      
Debt instrument, consecutive trading day period to determine convertibility                     30 days      
Stock price must exceed conversion price to allow conversion                     130.00%      
Debt instrument, convertible, number of equity instruments, shares                       80.9486 80  
Debt instrument, convertible, conversion price                       $ 12.35 $ 12.50  
Debt instrument, convertible, fundamental change stock price floor                     10.00      
Debt instrument, convertible, conversion rate increase upon fundamental change                     20      
Derivative, liability, fair value at issuance             37,000,000              
Derivative liabilities             107,000,000 43,100,000            
Conversion spread, shares of common stock                 7,474,817 16,000,000        
Derivative asset, strike price                 $ 12.35 $ 12.50        
Warrants, exercise price $ 15.75                          
Extinguishment of debt, amount                     108,000,000      
Extinguishment of debt, cash paid 168,700,000                   116,100,000      
Extinguishment of debt, cash paid for shares of common stock                     79,200,000      
Extinguishment of debt, shares issued                     3,643,402      
Extinguishment of debt, carrying value at extinguishment                     99,600,000      
Extinguishment of debt, gain (loss), net of tax                     (15,200,000)      
Net cash received from counterparties for settlement of call options and warrants 22,200,000                          
Warrants outstanding 7,474,817                          
Number of counterparties remaining under outstanding call options 2                          
Interest rate, effective percentage                     8.90%      
Interest expense on convertible notes $ 38,870,000 $ 28,479,000 $ 31,633,000 $ 26,400,000 $ 28,500,000 $ 31,600,000