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Acquisitions - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2018
USD ($)
Mar. 31, 2019
USD ($)
franchise
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
store
Business Acquisition [Line Items]        
Additional number of businesses acquired | franchise   2    
Payments to acquire businesses and asset acquisitions   $ (3,470) $ (4,774)  
Franchisee Acquisitions        
Business Acquisition [Line Items]        
Number of branded stores | store       152
Purchase price $ 189,826 189,826   $ 189,826
Revenue of acquiree since acquisition date   48,900 1,300  
Earnings or loss of acquiree since acquisition date   3,000 100  
Acquisition-related costs   1,400    
All Acquisitions Excluding SEI Acquisition        
Business Acquisition [Line Items]        
Payments to acquire businesses and asset acquisitions   $ (3,500) $ (4,800)