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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2017
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Retained Earnings Adjustments [Line Items] |  |
Reclassification from accumulated other comprehensive income to retained earnings tax effect |  | $ 0
Retained Earnings |  |
Retained Earnings Adjustments [Line Items] |  |
Reclassification from accumulated other comprehensive income to retained earnings tax effect |  | (229)
Accumulated Other Comprehensive Income (Loss) |  |
Retained Earnings Adjustments [Line Items] |  |
Reclassification from accumulated other comprehensive income to retained earnings tax effect |  | $ 229
Subsequent Event | ASU 2016-02 |  |
Retained Earnings Adjustments [Line Items] |  |
Right-of-use asset | $ 7,000 |
Lease liability | $ 8,500 |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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