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Equity Investees (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 01, 2016 | Mar. 31, 2016 | Jul. 25, 2015 | Jul. 24, 2015 | Jul. 23, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Unamortized excess cost amount | $ 382,400 | $ 398,100 |  |  |  |  |  |
Gain on basis step up on historical interest | $ 0 | $ 0 | $ 332,380 |  |  |  |  |
SEKCO [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  | 50.00% |  |
Poseidon Oil Pipeline Company [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity investment, ownership percentage | 64.00% |  |  |  |  |  |  |
Neptune Pipeline Company LLC [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity investment, ownership percentage | 25.70% |  |  |  |  |  |  |
Enterprise Offshore Acquisition [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Gain on basis step up on historical interest |  |  | $ 332,380 |  |  |  |  |
Transaction costs related to business acquisition |  |  |  |  |  |  | $ 1,500,000 |
Enterprise Offshore Acquisition [Member] | CHOPS [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest step up acquired percentage |  |  | 50.00% |  |  |  | 100.00% | 50.00%
Equity investment, ownership percentage |  |  | 50.00% |  |  |  | 50.00% | 50.00%
Enterprise Offshore Acquisition [Member] | SEKCO [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest step up acquired percentage |  |  | 50.00% |  |  |  | 100.00% | 50.00%
Equity investment, ownership percentage |  |  | 50.00% |  |  |  | 50.00% | 50.00%
Enterprise Offshore Acquisition [Member] | CHOPS and SEKCO |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Gain on basis step up on historical interest |  |  | $ 332,400 |  |  |  |  |
Enterprise Offshore Acquisition [Member] | Poseidon Oil Pipeline Company [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest step up acquired percentage |  |  |  |  |  |  | 64.00% | 28.00%
Equity investment, ownership percentage |  |  |  |  |  |  | 36.00% |
Enterprise Offshore Acquisition [Member] | Deepwater Gateway LLC [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity interest step up acquired percentage |  |  |  | 100.00% | 50.00% |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  | 50.00% |
Transaction costs related to business acquisition |  |  |  |  | $ 26,000 |  |  |
Enterprise Offshore Acquisition [Member] | Neptune Pipeline Company LLC [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  | 25.70% |

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