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Notes Payable and Amounts Due Under Repurchase Agreements (2021 Notes Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
2011 Line of Credit [Member]
Dec. 31, 2013
July 2021 Notes [Member]
Jul. 17, 2013
July 2021 Notes [Member]
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 400,000,000
Interest rate, stated percentage     6.625%  
Repayments of line of credit   15,000,000    
Extinguishment of debt, cash paid 168,700,000      
Net cash received from counterparties for settlement of call options and warrants 22,200,000      
Aggregate principal amount of convertible notes outstanding $ 160,300,000