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Summary of Significant Accounting Policies (Consolidation) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Consolidated Entities [Line Items] |  |
Purchase price | $ 1,200 |
Equity Method Investment, Ownership Percentage | 50.00% |
Total assets | $ 4,685,930 | $ 4,670,751
Borgata |  |
Consolidated Entities [Line Items] |  |
Equity Method Investment, Ownership Percentage | 50.00% |

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