Segment and Related Information, Revenue By Major Customer (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer	100.00%	100.00%
Restaurant and Retail [Member] | McDonald's Corporation [Member] | Reportable Segments [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer	25.00%	19.00%
Restaurant and Retail [Member] | Yum! Brands, Inc. [Member] | Reportable Segments [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer	11.00%	10.00%
Government Segment [Member] | U.S. Department of Defense [Member] | Reportable Segments [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer	35.00%	38.00%
All Others [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by customer	29.00%	33.00%