Quarterly report pursuant to Section 13 or 15(d)

(Schedule of Debt Interest Expense) (Details)

v3.20.1
(Schedule of Debt Interest Expense) (Details) - 2.5% Convertible Senior Notes Due 2019 and 2023 [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]  
Contractual interest coupon $ 1,278
Amortization of debt discount 1,066
Amortization of debt issuance costs 206
Interest Expense, Debt, Total $ 2,550