Quarterly report pursuant to Section 13 or 15(d)

(Schedule of Debt Interest Expense) (Details)

v3.20.2
(Schedule of Debt Interest Expense) (Details) - 2.0% Convertible Senior Notes Due 2025 [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Debt Instrument [Line Items]    
Contractual interest coupon $ 1,967 $ 3,244
Amortization of debt discount 1,597 2,662
Amortization of debt issuance costs 292 498
Total interest cost recognized on the notes $ 3,856 $ 6,404