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
1 Months Ended 3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]    
Amount Of Convertible Senior Notes Repurchase Price Allocated To APIC   $ (83,416)
2.5% Convertible Senior Notes Due 2019 [Member]    
Debt Instrument [Line Items]    
Extinguishment of Debt, Amount $ 223,300  
Interest rate, stated percentage 2.50% 2.50%
Cost to retire outstanding principal of convertible senior notes $ 305,200  
Rate assumed to calculate fair value of equity component 4.87% 4.87%
Amount Of Convertible Senior Notes Repurchase Price Allocated To APIC $ 83,400