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Summary of Significant Accounting Policies (Consolidation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Consolidated Entities [Line Items]
Purchase price	$ 1,200
Equity Method Investment, Ownership Percentage	50.00%
Total assets	$ 5,756,339	$ 4,685,930
Borgata
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Equity Method Investment, Ownership Percentage	50.00%

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