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Segment and Related Information - Revenue by Major Customers (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Operating segments | Restaurant/Retail | McDonald’s Corporation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 22.00% | 36.00% | 25.00% | 40.00%
Operating segments | Restaurant/Retail | Yum! Brands, Inc. |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 12.00% | 14.00% | 12.00% | 13.00%
Operating segments | Government | U.S. Department of Defense |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 34.00% | 23.00% | 31.00% | 23.00%
Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 32.00% | 27.00% | 32.00% | 24.00%

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