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Income Taxes Deferred tax assets and liabilties (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Taxes [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | $ 258 | $ 262
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 6,353 | 3,892
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 126 | 178
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance | 14,283 | 15,054
Deferred Tax Assets Operating Loss Carryforwards - State | 0 | 2,618
Deferred Tax Assets Operating Loss Carryforwards - Federal | 0 | 8,793
Unrecognized tax benefit | 1,037 | 1,052
Deferred Tax Assets, Other | 221 | 3
Deferred Tax Assets, Gross | 22,278 | 31,852
Deferred Tax Assets, Valuation Allowance | 0 | 0
Deferred Tax Assets, Net | 22,278 | 31,852
Deferred Tax Liabilities, Property, Plant and Equipment | (98,355) | (101,843)
Deferred Tax Liabilities, Goodwill and Intangible Assets | (18,959) | (15,939)
Deferred Tax Liabilities, Prepaid Expenses | (804) | (1,762)
Deferred Income Tax Liabilities | (118,118) | (119,544)
Deferred Tax Liabilities, Net | $ (95,840) | $ (87,692)

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