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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) entity | Dec. 31, 2016 USD ($) entity
Changes in AOCI, including the amounts reclassified to income |  |  |
Balance | $ 90,992,000 | $ 82,741,000 | $ 83,777,000
Balance | 102,166,000 | $ 90,992,000 | $ 82,741,000
Number of entities liquidated | entity |  | 1 | 2
Net loss from the cumulative translation adjustment |  | $ 1,700,000 | $ 100,000
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Balance | 62,411,000 | 62,002,000 |
Balance | 61,572,000 | 62,411,000 | $ 62,002,000
Foreign currency translation |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Unrecognized gain on foreign currency translation | (839,000) | 2,112,000 |
Unrealized gains (losses), net of tax |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Gain reclassified from AOCI to income |  | $ (1,703,000) |
AOCI Attributable to Noncontrolling Interest |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Balance | $ 0 |  |

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