v3.8.0.1

ORGANIZATION AND OPERATIONS Narrative 2 (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 04, 2017 | Apr. 28, 2017 | Apr. 18, 2017 | Feb. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 26, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from note offering, net of issuance costs |  |  |  |  | $ 543,333 | $ 0 | $ 0 |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Proceeds from Axeon term loan |  |  |  |  | $ 110,000 | $ 0 | $ 0 |
Common Limited Partner [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of units (units) |  |  | 14,375,000 |  | 14,375,000 | 595,050 |  |
Proceeds from common unit issuance including general partner contribution |  |  | $ 657,500 |  |  | $ 28,300 |  |
Net proceeds from issuance of units |  |  |  |  | $ 643,878 | 27,710 |  |
Series B Preferred Limited Partner [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of units (units) |  | 15,400,000 |  |  |  |  |  |
Preferred units distribution percentage |  | 7.625% |  |  |  |  |  |
Net proceeds from issuance of units |  | $ 371,800 |  |  |  |  |  |
5.625% senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes issued |  | $ 550,000 |  |  |  |  |  |
Stated interest rate |  | 5.625% |  |  | 5.625% |  |  |
Proceeds from note offering, net of issuance costs |  | $ 543,300 |  |  |  |  |  |
Axeon [Member] |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Axeon Term Loan Receivable |  |  |  |  |  |  |  | $ 190,000
Maximum Amount Guarantees |  |  |  |  |  | $ 125,000 |  |
Proceeds from Axeon term loan |  |  |  | $ 110,000 |  |  |  |
Navigator Acquisition [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price of Navigator Acquisition | $ 1,500,000 |  |  |  |  |  |  |

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