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Note 2 - Acquisitions & Divestitures - Business Acquisition Income Statement Supplemental Information of Valley Forge Convention Center Partners (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income	$ 48,484	$ 45,451	$ 38,945	$ 41,399	$ 93,935	$ 80,344
Valley Forge Convention Center Partners, L.P. [Member]
Total revenues	42,230				83,421
Net income	$ 7,577				$ 14,405

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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