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Debt - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt    
Total long-term debt $ 683,484 $ 728,173
Unamortized debt discount and issuance costs (80,035) (12,080)
Current portion of senior secured term loans (25,000) (7,752) [1]
Net long-term debt 578,449 708,341 [1]
Senior secured term loans    
Debt    
Total long-term debt 250,000 0
Current portion of senior secured term loans (25,000) 0
Convertible subordinated notes    
Debt    
Total long-term debt 240,984 240,984
Convertible senior notes    
Debt    
Total long-term debt 192,500 0
Non-Recourse Notes    
Debt    
Total long-term debt 0 487,189
Current portion of senior secured term loans $ 0 $ (7,752)
[1] Condensed consolidated balance sheet as of December 31, 2016 has been derived from audited consolidated financial statements.