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Debt, Net - Balances of Liability and Equity Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Liability component—principal amount $ 483,500 $ 483,500
Unamortized debt discount (27,828) (32,720)
Liability component—net carrying amount 455,672 450,780
Equity component $ 62,696 $ 62,696