Stock-Based Compensation - Partnership Long Term Incentive Plan and Phantom Unit Activity (Narratives) (Details)	9 Months Ended
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

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

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

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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.

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- Definition

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No definition available.

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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

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