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Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Property and equipment
Accumulated depreciation	$ 108,971,000	$ 106,478,000
Point loyalty program
Amount of liability for redeemable reward points	2,020,000	2,012,000
Revenue and expense recognition
Goods and services provided without charge to customers as promotional items	$ 5,005,000	$ 5,282,000
Revenues \| Business concentration risk \| Casino operations
Revenue and expense recognition
Percentage of total revenue accounted by casino operations	85.00%

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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