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Stockholders' Equity and Stock Incentive Plans (Classification of Costs) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 40,300,000 |  |
Share-based compensation expense | 8,927,000 |  | $ 3,083,000
Dividends, Share-based Compensation | 0.05 | $ 0.05 |
Stock Repurchased and Retired During Period, Value | $ 19,803,000 |  | 0
Average Repurchase Price per Share | $ 35.42 |  |
Gaming |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | $ 172,000 |  | 70,000
Food and Beverage |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | 33,000 |  | 13,000
Room |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | 15,000 |  | 6,000
Selling, General and Administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | 872,000 |  | 358,000
Corporate Expense |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation expense | $ 7,835,000 |  | $ 2,636,000
Common Stock |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock Repurchased and Retired During Period, Shares | 559,089 |  |
Release of performance stock units, net of tax | 337,537 |  | 173,653
Stock Repurchased and Retired During Period, Value | $ 6,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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