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Series B Convertible Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 16, 2019
Mar. 28, 2019
Feb. 03, 2019
Dec. 29, 2019
Redeemable Preferred Shares        
Preferred stock dividend rate       3.60%
Temporary equity       $ 251,133
Dividends paid to preferred shareholders       10,020
Series B Preferred Stock rollforward        
Balance at end of period       251,133
General and administrative expenses        
Redeemable Preferred Shares        
Temporary equity adjustment       5,900
Temporary equity adjustment       5,600
Series B Preferred Stock        
Redeemable Preferred Shares        
Temporary equity       251,133
Dividends paid to preferred shareholders       5,700
Preferred dividends $ 2,300     5,700
Dividends declared $ 2,300      
Common stock dividends paid to preferred shareholders       4,300
Series B Preferred Stock rollforward        
Balance at beginning of period      
Issuance of preferred stock       252,530
One time market-to-market adjustment       5,914
Issuance costs       (7,527)
Accretion       216
Balance at end of period       251,133
Series B Preferred Stock | Franchisee        
Redeemable Preferred Shares        
Aggregate purchase price of shares   $ 2,500    
Temporary equity adjustment       300
Series B Preferred Stock | Securities Purchase Agreement        
Redeemable Preferred Shares        
Aggregate purchase price of shares   $ 50,000 $ 200,000  
Purchase price per share     $ 1,000  
Preferred stock dividend rate     3.60%  
Conversion rate (as a percent)     $ 50.06  
Initial redemption term     8 years  
Exchange Cap (as a percent)     19.99%  
Issuance costs       7,500
Redemption value     $ 252,500  
Series B Preferred Stock | General and administrative expenses        
Redeemable Preferred Shares        
Aggregate purchase price of shares       50,000
Series B Preferred Stock | General and administrative expenses | Securities Purchase Agreement        
Redeemable Preferred Shares        
Temporary equity adjustment       $ 5,600