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Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Jul. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Jan. 31, 2010
Consolidated Entities [Line Items] |  |  |  |  |  |  |  |
Assets, Current |  | $ 270,300 |  |  | $ 270,300 |  | $ 257,232 |
Impairments of assets |  | 0 | $ 0 |  | 1,440 | $ 1,065 |  |
Assets |  | (4,456,654) |  |  | (4,456,654) |  | (4,350,900) |
Liabilities, Current |  | $ 389,103 |  |  | $ 389,103 |  | $ 355,071 |
Subsidiary, Borgata |  |  |  |  |  |  |  |
Consolidated Entities [Line Items] |  |  |  |  |  |  |  |
Net revenues | $ 91,870 |  | 237,461 | $ 485,510 |  | 611,213 |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 50.00%
Operating expenses | 63,997 |  | 175,248 | 366,812 |  | 495,473 |  |
Operating income | 27,873 |  | 62,213 | 118,698 |  | 115,740 |  |
Equity Method Investment, Summarized Financial Information, Non-operating Expenses | (6,104) |  | 25,363 | (36,280) |  | 58,909 |  |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | $ 21,769 |  | $ 36,850 | $ 82,418 |  | $ 56,831 |  |
MDDHC [Member] |  |  |  |  |  |  |  |
Consolidated Entities [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 1.00%
Subsidiaries [Member] |  |  |  |  |  |  |  |
Consolidated Entities [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 49.00%

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