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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (2029 Notes Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2009
Debt Instrument [Line Items]        
Change in fair value of embedded derivatives $ (543,465) $ 464,698 $ (32,321)  
Interest expense on convertible notes 28,248 28,849 36,370  
2029 Notes Embedded Conversion Derivative [Member]        
Debt Instrument [Line Items]        
Change in fair value of embedded derivatives $ 0 0 (3,809)  
Convertible Debt [Member]        
Debt Instrument [Line Items]        
Interest expense on convertible notes   $ 1,400 9,000  
Mandatory Redemption [Member] | 2029 Notes Embedded Conversion Derivative [Member]        
Debt Instrument [Line Items]        
Change in fair value of embedded derivatives     (3,800)  
December 2029 Notes [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 115,800
Adjustments to additional paid in capital, equity component of convertible debt       15,600
Deferred income tax liability, equity component of convertible debt       $ 11,000
Interest rate       5.25%
Interest rate, effective percentage   11.90%    
December 2029 Notes [Member] | Private Exchange Offers [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt, amount     36,200  
Extinguishment of debt, cash paid     66,700  
Extinguishment of debt, cash paid for shares of common stock     $ 23,200  
Extinguishment of debt, shares issued     946,793  
Extinguishment of debt, carrying value at extinguishment     $ 34,600  
Extinguishment of debt, gain (loss), net of tax     (2,500)  
December 2029 Notes [Member] | Mandatory Redemption [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt, amount     32,100  
Extinguishment of debt, cash paid     69,400  
Extinguishment of debt, cash paid for shares of common stock     $ 24,600  
Extinguishment of debt, shares issued     897,548  
Equity reclassified to an embedded derivative liability     $ 58,100