Partners' Equity and Equity-Based Compensation Nonvested Unit Options Activity (Details) shares in Thousands	12 Months Ended
Dec. 31, 2018 $ / shares shares
Deferred Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at period start (in shares) \| shares	44
Granted (in shares) \| shares	12
Forfeited (in shares) \| shares	0
Vested (in shares) \| shares	0
Unvested shares at period end (in shares) \| shares	56
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested shares at period start (in dollars per share) \| $ / shares	$ 55.41
Granted (in dollars per share) \| $ / shares	49.35
Forfeited (in dollars per share) \| $ / shares	0.00
Vested (in dollars per share) \| $ / shares	0.00
Unvested Shares at period end (in dollars per share) \| $ / shares	$ 54.21
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at period start (in shares) \| shares	532
Granted (in shares) \| shares	122
Forfeited (in shares) \| shares	(58)
Vested (in shares) \| shares	(217)
Unvested shares at period end (in shares) \| shares	379
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested shares at period start (in dollars per share) \| $ / shares	$ 57.18
Granted (in dollars per share) \| $ / shares	52.56
Forfeited (in dollars per share) \| $ / shares	59.10
Vested (in dollars per share) \| $ / shares	54.63
Unvested Shares at period end (in dollars per share) \| $ / shares	$ 56.86
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at period start (in shares) \| shares	252
Granted (in shares) \| shares	130
Forfeited (in shares) \| shares	(5)
Vested (in shares) \| shares	(67)
Unvested shares at period end (in shares) \| shares	310
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested shares at period start (in dollars per share) \| $ / shares	$ 59.75
Granted (in dollars per share) \| $ / shares	53.62
Forfeited (in dollars per share) \| $ / shares	60.74
Vested (in dollars per share) \| $ / shares	56.59
Unvested Shares at period end (in dollars per share) \| $ / shares	$ 57.85

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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-Publisher FASB
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- 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
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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

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