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INCOME TAXES - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Tax credits and loss carryforwards | $ 672 | $ 657
Accrued liabilities | 7,489 | 7,285
Incentive compensation | 14,420 | 12,132
Other | 5,423 | 6,747
Deferred tax assets, gross | 28,004 | 26,821
Deferred tax liabilities |  |
Property, plant and equipment | (17,899) | (14,695)
Intangibles | (44,477) | (42,343)
Other | (2,379) | (3,841)
Deferred tax liability | (64,755) | (60,879)
Net deferred tax liability before valuation allowances and reserves | (36,751) | (34,058)
Valuation allowances | (825) | (847)
Net deferred tax liability | $ (37,576) | $ (34,905)

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