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OTHER LONG-TERM DEBT (Schedule of Repayment of Loan) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Total outstanding principal amounts of loans [Member]  
Repayment schedule (carrying amount):  
2018 $ 49,629
2019 44,176
2020 33,006
2021 11,428
2022 and on
Total $ 138,239
U.S. Dollars [Member]  
Debt Instrument [Line Items]  
Interest rate Libor + 2.00%
Repayment schedule (carrying amount):  
2018 $ 5,714
2019 11,429
2020 11,429
2021 11,428
2022 and on
Total $ 40,000
JPY [Member]  
Debt Instrument [Line Items]  
Interest rate Tibor + 1.65%-2.00%
Repayment schedule (carrying amount):  
2018 $ 43,915
2019 32,747
2020 21,577
2021
2022 and on
Total $ 98,239