Unit-Based Compensation (Details 2) - Jun. 30, 2015 - USD ($) $ / shares in Units, $ in Millions	Total
Phantom Units
Phantom units outstanding at the beginning of the period (in units)	91,763
Granted (in units)	45,236
Vested (in units)	(52,224)
Phantom units outstanding at the end of the period (in units)	84,775
Weighted Average Grant-Date Fair Value per Unit
Phantom units outstanding at the beginning of the period (in dollars per unit)	$ 27.38
Granted (in dollars per unit)	24.87
Vested (in dollars per unit)	25.67
Phantom units outstanding at the end of the period (in dollars per unit)	$ 27.10
Unrecognized compensation cost
Expected unrecognized compensation cost related to unvested phantom units (in dollars)	$ 1.6
Weighted-average period during which the expected unrecognized compensation cost related to unvested phantom units to be recognized	2 years
First anniversary vesting
Unit-Based Compensation
Vesting percentage	33.33%
Vesting period	1 year
Second anniversary vesting
Unit-Based Compensation
Vesting percentage	33.33%
Vesting period	2 years
Third anniversary vesting
Unit-Based Compensation
Vesting percentage	33.33%
Vesting period	3 years

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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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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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).

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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).

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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.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of share-based compensation awards.

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