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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 20, 2016
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 163,843 $ 163,843 $ 86,841
Friendly’s Holdings        
Business Acquisition [Line Items]        
Aggregate purchase price $ 157,300      
Base purchase price 155,000      
Working capital adjustments 2,300      
Intangible assets acquired $ 81,700      
Weighted-average amortization period (in years) 15 years      
Unfavorable lease contract assumed $ 5,400      
Goodwill 77,002      
Acquisition-related expenses   $ 300 $ 4,400  
Friendly’s Holdings | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets acquired $ 29,700