Annual report pursuant to Section 13 and 15(d)

Debt (Interest Expense) (Details)

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Debt (Interest Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Accretion of debt discount $ 15,040 $ 11,134 $ 5,472
Coupon interest 8,917 6,650 3,019
Interest on credit agreement 4,065 3,994 4,153
Amortization of issuance costs 3,703 2,771 3,279
Undrawn and other fees 795 654 424
Total interest expense $ 32,520 $ 25,203 $ 16,347