Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (2.5% Convertible Senior Notes Due 2019) (Details)

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LONG-TERM DEBT (2.5% Convertible Senior Notes Due 2019) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Amount of convertible senior notes repurchase price allocated to APIC $ 92,641
2.5% Convertible Senior Notes Due 2019 [Member]  
Debt Instrument [Line Items]  
Extinguishment of Debt, Amount $ 246,300
Interest rate, stated percentage 2.50%
Cost to retire outstanding principal of convertible senior notes $ 336,700
Rate assumed to calculate fair value of equity component 4.87%
Amount of convertible senior notes repurchase price allocated to APIC $ 92,641