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INCOME TAXES - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Tax credits and loss carryforwards | $ 657 | $ 1,710
Accrued liabilities | 7,285 | 6,629
Incentive compensation | 12,132 | 13,867
Other | 6,747 | 2,852
Deferred tax assets, gross | 26,821 | 25,058
Deferred tax liabilities |  |
Property, plant and equipment | (14,695) | (12,813)
Intangibles | (42,343) | (45,960)
Other | (3,841) | (2,003)
Deferred tax liability | (60,879) | (60,776)
Net deferred tax asset before valuation allowances and reserves | (34,058) | (35,718)
Valuation allowances | (847) | (1,237)
Net deferred tax asset or liability | $ (34,905) | $ (36,955)

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