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Acquisitions Narrative (Details) $ in Thousands | Mar. 01, 2018 USD ($) storage_tank underground_saltwell | Sep. 15, 2017 USD ($) mi | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  | $ 154,038 | $ 15,917
Property, plant and equipment |  |  | 312,562 | $ 255,068
Big Spring Logistic Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price of asst acquisition | $ 170,800 |  |  |
Number of storage tanks | storage_tank | 75 |  |  |
Number of underground saltwells | underground_saltwell | 4 |  |  |
Excess of cash paid over carrying value | $ 98,800 |  |  |
Carrying value of assets acquired | 72,000 |  |  |
Assumed asset retirement obligation | 800 |  |  |
Capitalized acquisition costs |  |  | $ 400 |
Intangible assets | $ 144,200 |  |  |
Amortization period | 20 years |  |  |
Big Spring Pipeline |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price of asst acquisition |  | $ 9,000 |  |
Intangible assets |  | $ 2,600 |  |
Length of pipeline | mi |  | 40 |  |
Property, plant and equipment |  | $ 6,400 |  |

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