Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 02, 2011
Business Acquisition [Line Items]
Business acquisition, goodwill recorded	35,068
Business acquisition, intangible assets recorded	26,903
Business acquisition, intangible assets amortized period, years	7
Heartland Of Topeka, Kansas [Member]
Business Acquisition [Line Items]
Business acquisition date	January 2,2011
Business acquisition, cost of acquired entity, cash paid		$ 55,000
Premiere Of Toronto, Canada [Member]
Business Acquisition [Line Items]
Business acquisition date	January 28, 2011