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Summary of Significant Accounting Policies Concentration of Risk (Details)
12 Months Ended
Dec. 31, 2017
countries
states
distributors
customers
Concentration Risk  
Number of Customers Accounting for More Than 10% of Revenues | customers 0
Number of Main In-line Distributors 1
Number of Additional In-line Distributors 6
Number of States Where Restaurants are Located | states 50
Foreign Countries  
Concentration Risk  
Number of Countries Entity Operates (Including Canada) | countries 30
Main In-line Distributor Risk  
Concentration Risk  
Concentration Risk, Percentage 39.00%
Additional In-line Distributor Risk  
Concentration Risk  
Concentration Risk, Percentage 53.00%
Geographic Concentration Risk  
Concentration Risk  
Concentration Risk, Percentage 10.00%