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SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  | $ 33,767 | $ 57,225 | $ 43,833 | $ 52,349
Accumulated other comprehensive loss |  |  | (22,222) | (21,791) |  |
Assets |  |  | $ 947,361 | $ 930,946 |  |
ASU 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Pre-tax impact to retained earnings | $ 4,378 |  |  |  |  |
Cumulative impact to retained earnings | 3,319 |  |  |  |  |
ASU 2018-02 | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | (593) |  |  |  |  |
Accumulated other comprehensive loss | $ 593 |  |  |  |  |
ASU 2016-02 | Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Assets |  | $ 1,500 |  |  |  |
Liabilities |  | $ 1,500 |  |  |  |

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