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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Changes in AOCI, including the Amounts Reclassified to Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Changes in AOCI, including the amounts reclassified to income |  |
Balance | $ 102,166 | $ 90,992
Balance | 99,188 | 102,166
AOCI Including Portion Attributable to Noncontrolling Interest |  |
Changes in AOCI, including the amounts reclassified to income |  |
Balance | 61,572 | 62,411
Balance | 62,101 | 61,572
Foreign currency translation |  |
Changes in AOCI, including the amounts reclassified to income |  |
Unrecognized gain (loss) on foreign currency translation | $ (839) | $ 529

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