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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Recently adopted accounting standards (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Oct. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in accounting standard cumulative-effect adjustment | $ (1,525) | $ 0
Restatement Adjustment | Accounting Standards Update 2016-18 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Decrease in restricted cash |  | 8,600
Accumulated Net Investment Gain (Loss) Attributable to Parent |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in accounting standard cumulative-effect adjustment | $ (1,525) | $ 0

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