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Segment and Related Information, Revenue by Major Customers (Details) | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Operating segments | Restaurant/Retail | McDonald’s Corporation |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 27.00% | 44.00%
Operating segments | Restaurant/Retail | Yum! Brands, Inc. |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 11.00% | 12.00%
Operating segments | Government | U.S. Department of Defense |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 29.00% | 22.00%
Other |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 33.00% | 22.00%

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