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Acquisitions - Narrative (Details) $ in Thousands | Mar. 01, 2018 USD ($) storage_tank underground_saltwell | Sep. 15, 2017 USD ($) mi | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |  |  |
Property, plant and equipment |  |  |  | $ 314,670 | $ 255,068
Intangible assets, net |  |  |  | 155,840 | 15,917
Total |  |  |  | $ 693,569 | $ 443,530
Big Spring Logistic Assets |  |  |  |  |
Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  | $ 170,800 |  |  |
Number of storage tanks | storage_tank |  | 75 |  |  |
Number of underground saltwells | underground_saltwell |  | 4 |  |  |
Excess cash paid over book value |  | $ 98,800 |  |  |
Assets |  | 72,000 |  |  |
Asset retirement obligations |  | 800 |  |  |
Business Acquisition, Transaction Costs |  | 400 |  |  |
Intangible assets, net |  | $ 144,200 |  |  |
Big Spring Pipeline |  |  |  |  |
Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |  |  |
Length of pipeline (in miles) | mi |  |  | 40 |  |
Consideration transferred |  |  | $ 9,000 |  |
Finite-lived intangible amortization period |  | 20 years |  |  |
Property, plant and equipment |  |  | 6,443 |  |
Intangible assets, net | [1] |  | 2,560 |  |
Total |  |  | $ 9,003 |  |
[1] | Intangible assets acquired represent rights-of-way assets with indefinite useful lives. Rights-of-way assets are not subject to amortization.

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