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RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Income tax (benefit) | $ 363 | $ 2,523 | $ 150
Income tax benefit recognized as an operating activity | 0 | (619) | 0
Income tax expense recognized as a financing activity | 0 | (619) | 0
Non-current deferred income tax liabilities | 7,069 | 9,513 |
Cash classified to restricted cash | 3,532 | 0 |
ASU 2016-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Income tax (benefit) | (100) |  | 0
Income tax benefit recognized as an operating activity | 100 |  |
Income tax expense recognized as a financing activity | 600 | 200 | $ 800
ASU 2015-17 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Non-current deferred income tax liabilities |  | $ 9,513 |
ASU 2016-18 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash classified to restricted cash | $ 3,500 |  |

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