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Stockholders' Equity and Stock Incentive Plans (Classification of Costs) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 15,300,000 |  |  |  |  | $ 15,300,000 |
Share-based compensation expense | 5,367,000 |  |  |  | $ 2,382,000 | 20,316,000 | $ 11,212,000
Dividends, Share-based Compensation | 0.06 | $ 0.06 | $ 0.05 | $ 0.05 |  |  |
Stock Repurchased and Retired During Period, Value | $ 14,489,000 |  |  |  | $ 11,070,000 | $ 44,822,000 | $ 22,160,000
Average Repurchase Price per Share | $ 35.08 |  |  |  | $ 25.82 | $ 35.21 | $ 25.46
Gaming |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | $ 123,000 |  |  |  | $ 82,000 | $ 426,000 | $ 263,000
Food and Beverage |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | 23,000 |  |  |  | 15,000 | 81,000 | 50,000
Room |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | 11,000 |  |  |  | 8,000 | 39,000 | 24,000
Selling, General and Administrative |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | 627,000 |  |  |  | 418,000 | 2,168,000 | 1,337,000
Corporate Expense |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | $ 4,583,000 |  |  |  | $ 1,859,000 | $ 17,602,000 | $ 9,538,000
Common Stock |  |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 413,000 |  |  |  | 429,000 | 1,272,895 | 870,315
Release of performance stock units, net of tax |  |  |  |  |  | 337,537 | 173,653
Stock Repurchased and Retired During Period, Value |  |  |  |  |  | $ 13,000 | $ 8,000

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