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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Self-insurance $ 4,773 $ 5,729
Pension 8,105 9,617
State net operating loss carryforwards 5,853 1,445
Bad debt 1,302 1,392
Stock-based compensation 2,291 3,358
Inventory reserve 3,226 2,478
Impairment reserve 338 2,802
Foreign tax credits carryforwards   3,086
Federal net operating loss carryforwards   19,664
Basis differences in consolidated limited liability company 486 5,778
All others 1,126 2,191
Gross deferred tax assets 27,500 57,540
Deferred tax liabilities:    
Depreciation (33,486) (87,647)
Goodwill amortization (6,893) (6,763)
Basis differences in joint ventures (448) (444)
All others (5) (5)
Gross deferred tax liabilities (40,832) (94,859)
Net deferred tax liabilities $ (13,332) $ (37,319)