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Basis and Summary of Significant Accounting Policies - Related Party Transactions (Details)
$ in Millions
3 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2019
USD ($)
lease
franchise
Dec. 31, 2018
Dec. 31, 2004
Property
Related Party Transaction [Line Items]      
Threshold Period Past Due for Write-off of Trade Accounts Receivable   60 days  
Additional number of businesses acquired | franchise 2    
Related Party      
Related Party Transaction [Line Items]      
Sale leaseback, number of properties | Property     21
Number of capital leases | lease 2    
Number of operating leases | lease 4    
Capital leases, annual rental payments | $ $ 0.1    
Interest rate in the leases 9.70%    
Operating leases, annual rental payments | $ $ 0.2