Debt - Convertible Debt Notes (Details) - 1.75% Senior Notes Due 2026 - Senior Notes - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2020
Line of Credit Facility
Contractual interest expense	$ 2,188	$ 3,695
Amortization of debt discount	4,767	7,998
Amortization of issuance costs	315	524
Total Convertible Notes interest expense	$ 7,270	$ 12,217

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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