v3.8.0.1

NET INCOME (LOSS) PER UNIT (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Net Income Per Unit [Text Block] | The following table details the calculation of net income per common unit:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (Thousands of Dollars, Except Per Unit Data)
Net income attributable to NuStar Energy L.P. | $ | 147,964 |  |  | $ | 150,003 |  |  | $ | 306,720 |
Less: Distributions to general partner (including incentive distribution rights) | 54,921 |  |  | 51,284 |  |  | 51,064 |
Less: Distributions to common limited partners | 407,681 |  |  | 342,598 |  |  | 341,140 |
Less: Distributions to preferred limited partners | 40,448 |  |  | 1,925 |  |  | — |
Less: Distribution equivalent rights to restricted units | 2,965 |  |  | 2,697 |  |  | — |
Distributions in excess of earnings | $ | (358,051 | ) |  | $ | (248,501 | ) |  | $ | (85,484 | )
Net income attributable to common units: |  |  |  |  |
Distributions to common limited partners | $ | 407,681 |  |  | $ | 342,598 |  |  | $ | 341,140 |
Allocation of distributions in excess of earnings | (350,890 | ) |  | (243,530 | ) |  | (83,774 | )
Total | $ | 56,791 |  |  | $ | 99,068 |  |  | $ | 257,366 |
Basic weighted-average common units outstanding | 88,825,964 |  |  | 78,080,484 |  |  | 77,886,078 |
Diluted common units outstanding: |  |  |  |  |
Basic weighted-average common units outstanding | 88,825,964 |  |  | 78,080,484 |  |  | 77,886,078 |
Effect of dilutive potential common units | — |  |  | 32,518 |  |  | — |
Diluted weighted-average common units outstanding | 88,825,964 |  |  | 78,113,002 |  |  | 77,886,078 |
Basic and diluted net income per common unit | $ | 0.64 |  |  | $ | 1.27 |  |  | $ | 3.30 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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