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Income Taxes (Deferred Tax Assets/Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of Deferred Tax Assets and Liabilities [Abstract]      
Excess tax basis over book basis of property, plant, and equipment $ 7,773 $ 7,785 $ 7,893
Marketable securities 713 862 798
Operating loss carryforwards 27,943 26,464 35,001
Capital loss carryforwards 13,469 13,463 10,212
Other 1,783 2,725 2,891
Total future tax assets 51,681 51,299 56,795
Valuation allowance for future tax assets (50,209) (50,816) (54,397)
Total income tax assets 1,472 483 2,398
Other investments 1,472 483 1,916
Amayapampa disposal consideration     482
Total deferred income tax liabilities $ 1,472 $ 483 $ 2,398