FRANCHISE REVENUE (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
FRANCHISE REVENUE
Initial term of agreements	10 years
Types of flat franchise fees charged	3
Initial franchise fees recognized	$ 5,100,000	$ 4,000,000	$ 3,000,000
Franchise revenue
Franchise revenue	440,464,000	408,108,000	334,792,000
Product sales
Franchise revenue
Franchise revenue	364,500,000	340,574,000	275,026,000
Royalties
Franchise revenue
Franchise revenue	58,247,000	53,047,000	46,507,000
Franchise fees
Franchise revenue
Franchise revenue	8,166,000	7,024,000	5,585,000
Other
Franchise revenue
Franchise revenue	$ 9,551,000	$ 7,463,000	$ 7,674,000