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FINANCIAL INSTRUMENTS - Proceeds from Maturities and Sales of Current Available-for-Sale Marketable Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value Disclosures [Abstract]        
Proceeds from maturities of available-for-sale marketable debt securities $ 0 $ 115,000 $ 163,500 $ 125,000