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Summary of Significant Accounting Policies (Consolidation) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jan. 31, 2010
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Consolidated Entities [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Assets | $ 4,350,900 | $ 4,422,384 |  |
Borgata |  |  |  |
Consolidated Entities [Line Items] |  |  |  |
Assets |  |  | $ 1,318,155 |
MGM |  |  |  |
Consolidated Entities [Line Items] |  |  |  |
Equity method investment, ownership percentage |  |  |  | 50.00%

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