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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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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