Quarterly report pursuant to Section 13 or 15(d)

Derivative Contracts - Balance Sheet Component (Details)

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Derivative Contracts - Balance Sheet Component (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Common stock options/warrants | Investments, net    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value $ 5,543 $ 6,314
Embedded conversion option | 2033 Senior Notes, net of discount and estimated fair value of embedded derivatives    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 18,968 65,947
Forward contracts    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 5,016 944
Forward contracts | Unrealized gains on forward contracts are recorded in Prepaid expenses and other current assets. Unrealized losses on forward contracts are recorded in Accrued expenses.    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 65 $ 36