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SELECTED STATEMENTS OF INCOME DATA (Schedule of Financial Income and Other, Net) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement Related Disclosures [Abstract]      
Interest and amortization/accretion of premium/discount on marketable securities, net $ 2,537 $ 5,607 $ 6,844
Exchange rates differences 241 3,961
Realized gain on marketable securities 3,388 32
Interest 1,149 953 430
Financial income 3,927 13,909 7,306
Interest (9,580) (1,861) (66)
Debt issuance costs, amortization (6,943) (338)
Exchangeable Senior Notes amortization of discount (6,278)
Exchange rates differences (731)
Other (1,518) (925) (780)
Financial expense (24,319) (3,124) (1,577)
Other expenses, net (19) (480) (425)
Financial income and other, net $ (20,411) $ 10,305 $ 5,304