Investment in Laramie Energy, LLC - Change in Equity Investment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Equity earnings from Laramie Energy	$ (45,031)	$ 301
Laramie Energy Company
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	46,905
Equity earnings from Laramie Energy	263
Impairment of our investment in Laramie Energy	(45,294)
Ending balance	$ 1,874

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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