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LONG TERM DEBT (Schedule of Component of Term Debt Liability) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Principal $ 215,000 $ 475,000
Less: Debt issuance costs, net of amortization (3,486) (9,820)
Net carrying amount $ 211,514 $ 465,180