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Acquisitions - Narrative (Details) $ in Thousands | Mar. 01, 2018 USD ($) storage_tank underground_saltwell | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Schedule of Asset Acquisitions, by Acquisition [Line Items] |  |  |
Intangible assets, net |  | $ 157,643 | $ 15,917
Big Spring Pipeline |  |  |
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 |  |
Finite-lived intangible amortization period | 20 years |  |

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