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Income Taxes - Components of the Federal Deferred Tax Asset (Liability) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-term deferred tax asset (liability) [Abstract]    
Prepaid and other insurance $ (861)  
Prepaid and other insurance   $ 248
Property (12,807) (9,953)
Investment in unconsolidated affiliate 525 525
Valuation allowance related to investment in unconsolidated affiliate (525) (525)
Net operating loss 536 3,567
Other 423 (184)
Net long-term deferred tax liability $ (12,709) $ (6,322)