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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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