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Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Intangible Assets [Line Items]
Accumulated amortization	$ (13,220)	$ (18,236)
Intangible assets, net	130,999	138,210
Intangible assets, gross	159,816	172,274
Intangible assets, net	146,596	154,038
Rights-of-way assets
Other Intangible Assets [Line Items]
Rights-of-way assets	$ 15,597	$ 15,828
Supply contract
Other Intangible Assets [Line Items]
Estimated useful life (years)		11 years 6 months
Intangible assets, gross		$ 12,227
Accumulated amortization		(12,227)
Intangible assets, net		$ 0
Marketing contract
Other Intangible Assets [Line Items]
Estimated useful life (years)	20 years	20 years
Intangible assets, gross	$ 144,219	$ 144,219
Accumulated amortization	(13,220)	(6,009)
Intangible assets, net	$ 130,999	$ 138,210

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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