Incentive Plan (Summary of Long-Term Incentive Units) (Details)	3 Months Ended
Mar. 31, 2019 $ / shares shares
Units
Granted (shares)	105,843
Long-term incentive units
Units
Unvested beginning of period (shares)	158,486
Granted (shares)	105,135
Vested (shares)	(50,201)
Unvested end of period (shares)	213,420
Weighted-Average Grant Date Fair Value
Unvested, beginning of period (in dollars per share) \| $ / shares	$ 100.94
Granted (in dollars per share) \| $ / shares	116.07
Vested (in dollars per share) \| $ / shares	81.47
Unvested, end of period (in dollars per share) \| $ / shares	$ 98.10
Minimum \| Long-term incentive units
Weighted-Average Grant Date Fair Value
Award vesting period	2 years
Maximum \| Long-term incentive units
Weighted-Average Grant Date Fair Value
Award vesting period	4 years

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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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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