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Notes Payable and Amounts Due Under Repurchase Agreements (2024 Notes Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Shares of common stock issued upon extinguishment of convertible senior notes 5,489,808    
Repayments of notes payable $ 234,154,000 $ 0 $ 46,251,000
Interest expense on convertible notes 38,870,000 28,479,000 31,633,000
Convertible Debt [Member]
      
Debt Instrument [Line Items]      
Interest expense on convertible notes 26,400,000 28,500,000 31,600,000
December 2024 Notes [Member]
      
Debt Instrument [Line Items]      
Principal amount of convertible senior notes payable at issuance 260,000,000    
Adjustments to additional paid in capital, equity component of convertible debt 22,900,000    
Deferred income tax liability, equity component of convertible debt 16,100,000    
Principal amount of convertible senior notes payable, extinguished in exchange for subsequent issuance 63,600,000    
Repayments of convertible debt 25,800,000    
Shares of common stock issued upon extinguishment of convertible senior notes 216,729    
Repayments of notes payable $ 2,500,000    
Interest rate, effective percentage 8.50%