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Goodwill (Schedule of Goodwill By Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 27, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |  |  |
Gross carrying value | $ 1,246,177 |  |  |  |
Cumulative amortization | (6,134) |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss | 177,941 |  |  |  |
Goodwill | 1,062,102 | $ 888,224 | $ 826,476 |  | $ 685,310
Goodwill, Impairment Loss | 0 | 0 | (12,462) |  |
Las Vegas Locals |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross carrying value | 593,567 |  |  |  |
Cumulative amortization | 0 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss | 165,479 |  |  |  |
Goodwill | 428,088 |  |  |  |
Downtown Las Vegas |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross carrying value | 6,997 |  |  |  |
Cumulative amortization | (6,134) |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss | 0 |  |  |  |
Goodwill | 863 |  |  |  |
Midwest & South |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Gross carrying value | 645,613 |  |  |  |
Cumulative amortization | 0 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss | 12,462 |  |  |  |
Goodwill | 633,151 |  |  |  |
Goodwill, Impairment Loss |  |  | $ 12,500 |  |
Subsidiaries [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 173,900 | $ 61,700 |  | $ 130,324 |

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