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Financing Arrangements - Expenses in Relation to Convertible Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 06, 2016
Apr. 05, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Deferred financing cost amortization     $ 5,216 $ 5,216 $ 10,791
Convertible Debt          
Debt Instrument [Line Items]          
Interest expense at 3.50% coupon rate         687
Debt discount amortization         750
Deferred financing cost amortization         136
Interest expense         $ 1,573
Coupon Rate     3.50%    
Debt Instrument, Redemption, Period One | Convertible Debt          
Debt Instrument [Line Items]          
Conversion penalty percentage   0.50%      
Debt Instrument, Redemption, Period Two | Convertible Debt          
Debt Instrument [Line Items]          
Conversion penalty percentage 0.25%