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Acquisitions and Divestitures Investment in and Divestiture of Business (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 02, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Jan. 31, 2010
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, net |  | $ 888,224 |  | $ 888,224 |
Depreciation and amortization |  | 51,276 | $ 53,964 |  |
Lattner Entertainment Group Illinois, LLC [Domain] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Transferred |  | 100,000 |  |  |
Penn National Gaming, Inc. [Domain] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Transferred |  | 575,000 |  |  |
Valley Forge Convention Center Partners, L.P. [Domain] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Transferred |  | $ 280,500 |  |  |
Subsidiary, Borgata |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00%
Proceeds from Divestiture of Businesses | $ 900,000 |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested | 589,000 |  |  |  |
Refund From Tax Settlement | $ 72,000 |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  | $ 600 |  |

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