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Unit-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Schedule of Nonvested Share Activity | Phantom unit award activity for the years ended December 31, 2017 and December 31, 2016 consisted of the following:
| Number of Phantom Common Units |  | Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2015 | 1,147,048 |  |  | $ | 41.19 |
Granted | 966,337 |  |  | 26.95 |
Vested | (1,240 | ) |  | 36.98 |
Forfeited | (98,511 | ) |  | 39.77 |
Outstanding at December 31, 2016 | 2,013,634 |  |  | 34.43 |
Granted | 203,867 |  |  | 28.31 |
Vested | (289,377 | ) |  | 45.48 |
Forfeited | (150,823 | ) |  | 34.71 |
Outstanding at December 31, 2017 | 1,777,301 |  |  | $ | 31.89 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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