Investment in Laramie Energy, LLC - Change in Equity Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	$ 136,656
Equity earnings (losses) from Laramie Energy, LLC	(89,751)	$ 9,464	$ 18,369
Ending balance	46,905	136,656
Laramie Energy Company
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	136,656	127,192	108,823
Equity earnings (losses) from Laramie Energy, LLC	(175,018)	4,487	13,043
Accretion of basis difference	5,018	4,977	5,326
Adjustment of basis difference	161,764	0	0
Impairment of our investment in Laramie Energy	(81,515)	0	0
Ending balance	$ 46,905	$ 136,656	$ 127,192

Amount of increase (decrease) in assets of equity method investment related to accretion of basis difference.

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- Definition

Increase (Decrease) In Assets Of Equity Method Investment Adjustment Of Basis Difference

+ References

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- Definition

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.

+ References

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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