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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

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