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SIGNIFICANT ACCOUNTING POLICIES (Recent Accounting Pronouncements) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other (expense) income, net | $ (4,061,000) | $ (996,000) | $ 846,000 | $ (299,000) | $ (3,305,000) | $ (432,000) | $ (833,000) | $ (1,549,000) | $ (4,510,000) | $ (6,119,000) | $ 6,195,000 |
Cumulative effect of change in accounting principle | (1,564,000) |  |  |  | 231,000 |  |  |  | (1,564,000) | 231,000 |  |
ASU 2016-01 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other (expense) income, net | 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Accumulated Earnings |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle | $ (1,564,000) |  |  |  | (450,000) |  |  |  | $ (1,564,000) | (450,000) |  |
Accumulated Earnings | ASU 2016-16 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ (1,600,000) |  |  |  |  | $ (1,600,000) |  |
Scenario, Forecast | Minimum | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  | $ 180,000,000
Operating liabilities |  |  |  |  |  |  |  |  |  |  |  | 180,000,000
Scenario, Forecast | Maximum | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  | 220,000,000
Operating liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 220,000,000

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