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Long-Term Debt (Notes Payable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Principal amount of Notes $ 325,000 $ 325,000 $ 0
Unamortized debt issuance costs (8,661)   0
Total convertible notes payable $ 316,339   $ 0