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Business Acquisition, Equity Interest Acquired, Number of Shares

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Business Combination, Share Conversion Rate

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The general partner's ownership interest in partnership as a percentage.

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Ownership Percentage Held By Public Unitholders In Reporting Entity

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Number of shares of equity interests issued or issuable to acquire entity.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date.

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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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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Monetary value of the issuance of new units of limited partnership interest in a public offering.

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Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include general, limited and preferred partners.

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Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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Equity (Narratives) (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 24, 2018 $ / shares	Apr. 26, 2018 USD ($) shares	Apr. 25, 2018	Aug. 31, 2017 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Class of Stock
Ownership percentage held by reporting entity			57.00%
Deferred tax asset, net					$ 55,000		$ 55,000
Deferred tax asset valuation allowance					53,400		53,400
Adjustments to additional paid in capital, deferred tax asset							103,100
Merger-related costs					$ 182	$ 0	$ 9,993	$ 0
Net proceeds from sale of partnership units, net of tax								$ 49,726
Subsequent Event
Distributions
Dividend declared per common stock (in dollars per share) \| $ / shares	$ 0.132
Limited Partner Common Units
Class of Stock
Shares issued (shares) \| shares				4,600,000
Shares issued, value				$ 60,300
Limited Partner Common Units \| Parent Company
Class of Stock
Net proceeds from sale of partnership units, net of tax				$ 1,300
General partner units interest (as a percentage)				2.00%
General Partner
Class of Stock
Partners' capital accounts (units) \| shares				93,163
Over-allotment option \| Limited Partner Common Units
Class of Stock
Shares issued (shares) \| shares				600,000
Partnership Merger
Class of Stock
Deferred tax asset acquired		$ 156,500
Partnership Merger \| Common Stock
Class of Stock
Business acquisition, shares issued (shares) \| shares		57,600,000.0
Business acquisition, shares acquired (shares) \| shares		41,200,000.0
Share conversion rate (per share)		1.40
Value of shares used as consideration		$ 625,300