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Income Taxes Deferred tax assets and liabilties (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Taxes [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | $ 262 | $ 224
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 3,892 | 3,179
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 178 | 92
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance | 15,054 | 15,415
Deferred Tax Assets Operating Loss Carryforwards - State | 2,618 | 0
Deferred Tax Assets Operating Loss Carryforwards - Federal | 8,793 | 0
Unrecognized tax benefit | 1,052 | 963
Deferred Tax Assets, Other | 3 | 2
Deferred Tax Assets, Gross | 31,852 | 19,875
Deferred Tax Assets, Valuation Allowance | 0 | 0
Deferred Tax Assets, Net | 31,852 | 19,875
Deferred Tax Liabilities, Property, Plant and Equipment | (101,843) | (74,794)
Deferred Tax Liabilities, Goodwill and Intangible Assets | (15,939) | (10,319)
Deferred Tax Liabilities, Prepaid Expenses | (1,762) | (1,268)
Deferred Income Tax Liabilities | (119,544) | (86,381)
Deferred Tax Liabilities, Net | $ (87,692) | $ (66,506)

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