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Notes Payable and Amounts Due Under Repurchase Agreements (Liability and Equity Components of Convertible Senior Notes) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Principal amount of liability component $ 160,300  
September 2015 Notes [Member]
    
Debt Instrument [Line Items]    
Principal amount of liability component 91,951 200,000
Unamortized discount (6,623) (21,944)
Net carrying amount of liability component 85,328 178,056
Amount by which the if-converted value exceeds principal 104,403 0
December 2029 Notes [Member]
    
Debt Instrument [Line Items]    
Principal amount of liability component 68,373 115,839
Unamortized discount (3,743) (12,269)
Net carrying amount of liability component 64,630 103,570
Carrying amount of equity component 15,586 15,586
Amount by which the if-converted value exceeds principal 113,169 30,382
December 2024 Notes [Member]
    
Debt Instrument [Line Items]    
Principal amount of liability component   28,243
Unamortized discount   0
Net carrying amount of liability component   28,243
Carrying amount of equity component   22,637
Amount by which the if-converted value exceeds principal   $ 0