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Equity Method Investments (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 terminal | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) joint_venture | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments, number of joint ventures | joint_venture |  |  |  | 2 |  |
Investment in joint ventures |  | $ 106,432 |  | $ 106,432 |  | $ 106,465
CP LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as percent) |  | 50.00% |  | 50.00% |  |
Rangeland Rio |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as percent) |  | 33.00% |  | 33.00% |  |
Joint Ventures |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Current assets |  | $ 18,195 |  | $ 18,195 |  | 12,671
Non-current assets |  | 241,564 |  | 241,564 |  | 244,329
Current liabilities |  | 3,876 |  | 3,876 |  | $ 1,798
Revenues |  | 9,886 | $ 7,022 | 17,876 | $ 12,693 |
Gross profit |  | 9,886 | 7,022 | 17,876 | 12,693 |
Net income |  | $ 4,800 | $ 3,379 | $ 7,512 | $ 4,392 |
DKGP Energy Terminals, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest (as percent) | 50.00% |  |  |  |  |
Equity method investment, number of terminals acquired | terminal | 2 |  |  |  |  |

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