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INCOME TAXES - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Tax credits and loss carryforwards | $ 2,518 | $ 672
Accrued liabilities | 6,415 | 7,489
Incentive compensation | 9,202 | 14,420
Other | 328 | 5,423
Deferred tax assets | 18,463 | 28,004
Deferred tax liabilities |  |
Property, plant and equipment | (22,355) | (17,899)
Intangibles | (40,043) | (44,477)
Other | (1,822) | (2,379)
Deferred tax liabilities | (64,220) | (64,755)
Net deferred tax liability before valuation allowances and reserves | (45,757) | (36,751)
Valuation allowances | (1,020) | (825)
Net deferred tax liability | $ (46,777) | $ (37,576)

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