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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Carrying value of inventories $ 3,470 $ 3,212
Accrued liabilities and allowances deductible for tax purposes on a cash basis 13,086 8,945
Goodwill 1,704 1,976
Stock-based compensation 2,559 2,500
Operating right-of-use lease liabilities 20,003 19,087
Net operating loss carryforwards 19,120 19,493
Tax credit carryforwards 3,368 2,421
Interest rate swap liabilities 2,263 1,210
Other 5,025 3,938
Gross deferred tax assets 70,598 62,782
Less: valuation allowance (19,038) (15,992)
Net deferred tax assets 51,560 46,790
Plant and equipment, due to differences in depreciation (7,899) (10,428)
Operating right-of-use lease assets (19,742) (18,826)
Intangible assets, due to differences in amortization (14,078) (16,302)
Foreign withholding tax (6,102) (7,181)
Other (3,603) (2,283)
Gross deferred tax liability (51,424) (55,020)
Net deferred tax liability   (8,230)
Long-term asset 4,924 5,274
Long-term liability (4,788) $ (13,504)
Net deferred tax Asset $ 136