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Income Taxes The Major Components of the Company's Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Valuation Allowance    
Deferred Income Taxes and Tax Credits $ 4,523 $ 10,995
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 1,214 1,214
Deferred Tax Assets, Net of Valuation Allowance 19,087 28,920
Deferred Tax Liabilities, Prepaid Expenses 3,625 2,517
Deferred Tax Liabilities, Other 9,476 19,900
Deferred Tax Liabilities, Gross 365,224 330,683
Deferred Income Tax Liabilities, Net 346,137 301,763
Accrued Vacation    
Valuation Allowance    
Deferred Tax Assets, Gross 1,197 1,024
Deferred Tax Assets, Accrued Bonus    
Valuation Allowance    
Deferred Tax Assets, Gross 4,086 0
State Taxes    
Valuation Allowance    
Deferred Tax Assets, Gross 248 0
Accrued Property Taxes    
Valuation Allowance    
Deferred Tax Assets, Gross 1,048 1,111
Stock Based Compensation    
Valuation Allowance    
Deferred Tax Assets, Gross 1,372 1,025
Valuation Allowance, Operating Loss Carryforwards    
Valuation Allowance    
Deferred Tax Assets, Gross $ 7,827 $ 15,979