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Income Taxes - Deferred Tax Assets/Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets and Liabilities [Abstract]
Excess tax basis over book basis of property, plant, and equipment	$ 8,295	$ 7,488
Marketable securities	500	667
Operating loss carryforwards	36,716	34,052
Capital loss carryforwards	13,618	13,276
Other	1,085	2,031
Total future tax assets	60,214	57,514
Valuation allowance for future tax assets	(59,886)	(56,659)
Total income tax assets	328	855
Other investments	328	855
Total deferred income tax liabilities	$ 328	$ 855

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