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Unit-Based Compensation | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Unit-Based Compensation | Unit-Based Compensation The Partnership has issued phantom units to its employees and non-employee directors, which vest 60% after three years and 40% after five years. Phantom units have the right to receive distributions prior to vesting. The fair value of these units is the market price of our common units on the grant date, and is amortized over the five-year vesting period using the straight-line method. Unit-based compensation expense related to the Partnership included in our Consolidated Statements of Operations and Comprehensive Income was $24 million, $13 million and $8 million for the years ended December 31, 2017, 2016 and 2015, respectively. The total fair value of phantom units vested for the years ended December 31, 2017, 2016 and 2015, was $9 million, $0 million and $0 million, respectively, based on the market price of SUN’s common units as of the vesting date. Unrecognized compensation expenses related to our nonvested phantom units totaled $27 million as of December 31, 2017, which are expected to be recognized over a weighted average period of 3.7 years. The fair value of nonvested phantom units outstanding as of December 31, 2017 and December 31, 2016, totaled $57 million and $69 million, respectively. 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 |
The Partnership previously granted cash restricted units, which vested in cash. As of December 31, 2017, no such awards remained outstanding.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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- References No definition available. + Details
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