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Convertible Senior Notes - Equity Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Nov. 30, 2013
2022 Notes    
Debt Instrument [Line Items]    
Note $ 162,039  
Issuance cost (2,148)  
Net amount recorded in equity $ 159,891  
2018 Notes    
Debt Instrument [Line Items]    
Note   $ 155,319
Issuance cost   (3,257)
Net amount recorded in equity   $ 152,062