Segment and Related Information, Revenue By Major Customer (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer (in hundredths)	100.00%	100.00%	100.00%	100.00%
McDonald's Corporation [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer (in hundredths)	25.00%	20.00%	19.00%	18.00%
Yum! Brands, Inc. [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer (in hundredths)	11.00%	16.00%	14.00%	15.00%
U.S. Department of Defense [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer (in hundredths)	33.00%	36.00%	37.00%	38.00%
All Others [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer (in hundredths)	31.00%	28.00%	30.00%	29.00%