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Debt and Credit Facility, Additional Information Regarding Convertible Notes (Details) - Convertible Notes Payable - Convertible Notes - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument    
Contractual coupon interest   $ 2.0
Amortization of discount   2.4
Amortization of debt issuance costs   $ 0.3
Total interest expense $ 4.7