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Stockholders' Equity and Stock Incentive Plans (Classification of Costs) (Details) - USD ($)	3 Months Ended
	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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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.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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