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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)