Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Schedule of Debt Interest Expense) (Details)

v3.10.0.1
LONG-TERM DEBT (Schedule of Debt Interest Expense) (Details) - 2.5% Convertible Senior Notes Due 2023 [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Debt Instrument [Line Items]    
Contractual interest coupon $ 3,361 $ 7,257
Amortization of debt discount 2,996 5,951
Amortization of debt issuance costs 534 1,068
Total interest cost recognized on the notes $ 6,891 $ 14,276