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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, 2020
Dec. 31, 2019
Valuation Allowance    
Deferred Income Taxes and Tax Credits $ 10,995 $ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 1,214 1,193
Deferred Tax Assets, Net of Valuation Allowance 28,920 66,548
Deferred Tax Liabilities, Other 20,242 14,522
Accrued Vacation    
Valuation Allowance    
Deferred Tax Assets, Gross 1,024 907
Deferred Tax Assets, Accrued Bonus    
Valuation Allowance    
Deferred Tax Assets, Gross 0 5,523
State Taxes    
Valuation Allowance    
Deferred Tax Assets, State Taxes 0 88
Accrued Property Taxes    
Valuation Allowance    
Deferred Tax Assets, Gross 1,111 1,742
Stock Based Compensation    
Valuation Allowance    
Deferred Tax Assets, Gross 1,025 1,415
Valuation Allowance, Operating Loss Carryforwards    
Valuation Allowance    
Deferred Tax Assets, Gross 15,979 58,066
Prepaid Expenses    
Valuation Allowance    
Deferred Tax Liabilities, Prepaid Expenses 2,517 6,211
Depreciation    
Valuation Allowance    
Deferred Tax Liabilities, Other 308,266 278,554
Total Noncurrent    
Valuation Allowance    
Deferred Tax Liabilities, Gross 331,025 299,287
Total    
Valuation Allowance    
Deferred Income Tax Liabilities, Net $ 302,105 $ 232,739