Significant Accounting Policies (Condensed Consolidated Statement of Earnings) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Operating revenue		$ 43,564	$ 43,791	$ 123,834	$ 122,531
Less: Promotional allowances	[1]		(2,743)		(7,756)
Net operating revenue		43,564	41,048	123,834	114,775
Changes Related to Adoption of ASU 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		3,152		8,621
Less: Promotional allowances		(3,152)		(8,621)
Revised [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		46,716		132,455
Less: Promotional allowances		(3,152)		(8,621)
Net operating revenue		43,564		123,834
Gaming [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		35,983	36,914	102,595	102,814
Net operating revenue		35,983	36,914	102,595	102,814
Operating costs and expenses		18,490	17,094	52,666	48,796
Gaming [Member] | Changes Related to Adoption of ASU 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		3,152		8,621
Operating costs and expenses		325		915
Gaming [Member] | Revised [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		39,135		111,216
Operating costs and expenses		18,815		53,581
Hotel [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		575	560	1,534	1,491
Net operating revenue		575	560	1,534	1,491
Operating costs and expenses		197	171	551	468
Hotel [Member] | Changes Related to Adoption of ASU 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Operating costs and expenses		(10)		(36)
Hotel [Member] | Revised [Member]
Disaggregation of Revenue [Line Items]
Operating costs and expenses		187		515
Food And Beverage [Member]
Disaggregation of Revenue [Line Items]
Operating revenue		4,290	3,868	11,630	10,622
Net operating revenue		4,290	3,868	11,630	10,622
Operating costs and expenses		4,148	$ 3,388	11,708	$ 9,452
Food And Beverage [Member] | Changes Related to Adoption of ASU 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Operating costs and expenses		(315)		(879)
Food And Beverage [Member] | Revised [Member]
Disaggregation of Revenue [Line Items]
Operating costs and expenses		$ 3,833		$ 10,829

[1] See Note 2 for a discussion of the impact of the adoption of ASU 2014-09 on the presentation of promotional allowances