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Income Taxes, Deferred Tax Assets/Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Deferred Tax Assets and Liabilities [Abstract]      
Excess tax basis over book basis of property, plant, and equipment $ 7,488 $ 7,773 $ 7,785
Marketable securities 771 713 862
Operating loss carryforwards 28,530 27,943 26,464
Capital loss carryforwards 13,470 13,469 13,463
Other 1,848 1,783 2,725
Total future tax assets 52,107 51,681 51,299
Valuation allowance for future tax assets (51,406) (50,209) (50,816)
Total income tax assets 701 1,472 483
Other investments 701 1,472 483
Total deferred income tax liabilities $ 701 $ 1,472 $ 483