Summary of Significant Accounting Policies - Pre-opening and Development Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pre-opening and Development Costs
Pre-opening and development costs	$ 21,633	$ 8,817	$ 13,649
Baton Rouge
Pre-opening and Development Costs
Pre-opening and development costs	16,000	4,300	1,200
River City
Pre-opening and Development Costs
Pre-opening and development costs	100	200	9,900
Other
Pre-opening and Development Costs
Pre-opening and development costs	$ 5,500	$ 4,300	$ 2,500