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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unamortized discount $ (25,704) $ (32,256)  
2% Convertible Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Principal amount of Senior Notes 201,250 $ 201,250 $ 201,300
Unamortized discount $ 25,700