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Acquisitions and Divestitures Investment in and Divestiture of Business (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Aug. 02, 2016 USD ($) | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 17, 2018 USD ($) | Jun. 01, 2018 USD ($) | Jan. 31, 2010
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  | $ 1,983 |  | $ 2,589 |  |  |
Number of Lattner Gaming Units | property |  |  | 1,000 |  |  |  |  |  |  |
Number of Lattner Locations | property |  |  | 220 |  |  |  |  |  |  |
Gross Revenues |  |  | $ 612,196 | $ 591,542 | 1,835,107 | $ 1,805,731 |  |  |  |
Goodwill, net | $ 1,201,862 |  | 1,201,862 |  | 1,201,862 |  | 888,224 |  |  |
Depreciation and amortization |  |  | 54,688 | 55,201 | 159,887 | 161,728 |  |  |  |
Net income |  |  | 11,837 | 23,157 | 92,181 | 107,317 |  |  |  |
Project development, preopening and writedowns |  |  | 18,588 | $ 2,975 | 27,829 | 8,731 |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  | 89 |  | $ 186 |  |  |
Penn National Gaming, Inc. [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Transferred |  |  |  |  | 569,900 |  |  |  |  |
Valley Forge Convention Center Partners, L.P. [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Gross Revenues | 5,840 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets |  |  |  |  |  |  |  | $ 29,909 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  | 47,762 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  | 483 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  | 78,154 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  |  |  |  |  |  | 12,028 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities |  |  |  |  |  |  |  | 606 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  | 12,634 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  | 65,520 |  |
Business Combination, Net Purchase Price |  |  |  |  |  |  |  | 266,600 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  | 291,364 |  |
Goodwill, net |  |  |  |  |  |  |  | 225,844 |  |
Net income | $ 780 |  |  |  |  |  |  |  |  |
Project development, preopening and writedowns |  |  | 2,900 |  | 3,400 |  |  |  |  |
Lattner Entertainment Group Illinois, LLC [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets |  |  |  |  |  |  |  |  | $ 9,889 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 9,063 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  |  | 4,033 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  | 22,985 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  |  |  |  |  |  |  | 1,062 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  | 1,062 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  |  | 21,923 |
Business Combination, Net Purchase Price |  |  |  |  |  |  |  |  | 100,700 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  |  | 110,538 |
Goodwill, net |  |  |  |  |  |  |  |  | 88,615 |
Project development, preopening and writedowns |  |  | $ 100 |  | 600 |  |  |  |  |
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 |  |  |  |  |  |  |  |
Borgata [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  | $ 300 | 36,200 |  |  |  |
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation |  |  |  |  |  | $ 14,800 |  |  |  |
Land | Valley Forge Convention Center Partners, L.P. [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land |  |  |  |  |  |  |  | 650 |  |
Buildings and improvements | Valley Forge Convention Center Partners, L.P. [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  | 32,883 |  |
Buildings and improvements | Lattner Entertainment Group Illinois, LLC [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | 14 |
Furniture and equipment | Valley Forge Convention Center Partners, L.P. [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  | 13,800 |  |
Furniture and equipment | Lattner Entertainment Group Illinois, LLC [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 9,049 |
Construction in progress | Valley Forge Convention Center Partners, L.P. [Domain] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, CIP |  |  |  |  |  |  |  | $ 429 |  |

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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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