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Stock-Based Compensation - Partnership Long Term Incentive Plan and Phantom Unit Activity (Narratives) (Details) | 9 Months Ended
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Sep. 30, 2018 $ / shares shares
Partnership Phantom Units | First anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Partnership Phantom Units | Second anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Partnership Phantom Units | Third anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Restricted stock units |
Stock-Based Compensation |
Vested (in shares) | shares | 747,000
Vested (in dollars per share) | $ / shares | $ 10.46
Restricted stock units | First anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Restricted stock units | Second anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Restricted stock units | Third anniversary vesting |
Stock-Based Compensation |
Vesting percentage | 33.33%
Partnership Long Term Incentive Plan | Partnership Phantom Units |
Stock-Based Compensation |
Vested (in shares) | shares | 53,091
Vested (in dollars per share) | $ / shares | $ 11.24

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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