Income Taxes Deferred tax assets and liabilties (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	$ 261	$ 258
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	5,452	6,353
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	36	126
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance	11,455	14,283
Deferred Tax Assets Operating Loss Carryforwards - State	46	0
Unrecognized tax benefit	981	1,037
Deferred Tax Assets, Other	227	221
Deferred Tax Assets, Gross	18,458	22,278
Deferred Tax Assets, Valuation Allowance	0	0
Deferred Tax Assets, Net	18,458	22,278
Deferred Tax Liabilities, Property, Plant and Equipment	(87,004)	(98,355)
Deferred Tax Liabilities, Goodwill and Intangible Assets	(20,538)	(18,959)
Deferred Tax Liabilities, Prepaid Expenses	(887)	(804)
Deferred Income Tax Liabilities	(108,429)	(118,118)
Deferred Tax Liabilities, Net	$ (89,971)	$ (95,840)