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INCOME TAXES - Reconciliation of Provision for Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Income tax at federal statutory rate | $ 7,249 | $ 15,200
Effect of permanent differences | 346 | 459
Tax Cut & Jobs Act one-time transition tax | (738) | 20,792
Global Intangible Low Taxed Income | 3,964 | 0
Tax Cut & Jobs Act federal rate change | (6) | 954
Change in valuation allowance | (9) | (43)
Foreign rate differential | (6,541) | (15,002)
Foreign tax credits | (786) | (2,738)
Other reconciling items | 7 | 226
Income tax provision | $ 3,486 | $ 19,848

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