Annual report pursuant to Section 13 and 15(d)

Derivative Contracts - Fair Value and Presentation (Details)

v3.6.0.2
Derivative Contracts - Fair Value and Presentation (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Common stock options/warrants | Investments, net    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value $ 4,017 $ 5,338
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 16,736 23,737
Forward contracts | Unrealized gains on forward contracts are recorded in Other current assets and prepaid expenses. Unrealized (losses) on forward contracts are recorded in Accrued expenses.    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 39 $ 9