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Stockholders' Equity and Stock Incentive Plans (Classification of Costs) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 9,709,000		$ 8,927,000
Stock Repurchase Program, Authorized Amount	100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	78,900,000
Dividends, Share-based Compensation	0.06	$ 0.06	0.05	$ 0.05
Stock Repurchased and Retired During Period, Value	$ 21,653,000		$ 19,803,000
Average Repurchase Price per Share	$ 26.09		$ 35.42
Common Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Repurchased and Retired During Period, Shares	830,100		559,089
Release of performance stock units, net of tax	270,960		337,537
Stock Repurchased and Retired During Period, Value	$ 8,000		$ 6,000
Gaming Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	194,000		172,000
Food and Beverage Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	37,000		33,000
Room Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	18,000		15,000
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	988,000		872,000
Corporate Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 8,472,000		$ 7,835,000

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