Income Taxes - Components of the Federal Deferred Tax Asset (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term deferred tax asset (liability) [Abstract]
Deferred Tax Assets, Prepaid and Other Insurance	$ 248
Prepaid and other insurance		$ (170)
Property	(9,953)	(5,259)
Investments in unconsolidated affiliates	525	525
Valuation allowance related to investments in unconsolidated affiliates	(525)	(525)
Net operating loss	(3,567)	(1,436)
Other	(184)	(245)
Net long-term deferred tax liability	(6,322)	(4,238)
Net deferred tax liability	$ (6,322)	$ (4,238)