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Acquisitions and Divestitures Asset Acquisition - Valley Forge (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Valley Forge Convention Center Partners, L.P. [Domain]
Business Acquisition [Line Items]
Business Combination, Transferred	$ 280.5

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- Definition

Business Combination, Transferred

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- Definition

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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No definition available.

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