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Summary of Significant Accounting Policies (Organization) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) entity segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Organization Attributes [Line Items] |  |  |  |
Subsidiaries, Ownership Percentage | 80.00% |  |  |
Interest Costs Capitalized |  | $ 500 | $ 100 |
Income Tax Expense (Benefit) | $ 3,115 | (199,933) | (6,625) |
Number of Gaming Entertainment Properties | entity | 24 |  |  |
Number of reportable segments | segment | 3 |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,097,227 | 930,180 | $ 501,837 | $ 438,087
Deferred income taxes | (86,657) | (81,454) |  |
Accrued liabilities | 255,146 | $ 257,554 |  |
Adjustments for Change in Accounting Principle [Domain] |  |  |  |
Organization Attributes [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 1,500 |  |  |

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