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Stock-Based Compensation - Partnership Long Term Incentive Plan and Phantom Unit Activity (Narratives) (Details)	6 Months Ended
	Jun. 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	503,000
Vested (in dollars per share) | $ / shares	$ 9.56
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

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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-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

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+ References

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Percentage of vesting of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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