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Debt - Narrative (Details)
12 Months Ended
Feb. 10, 2020
USD ($)
$ / shares
shares
Dec. 18, 2019
USD ($)
Apr. 15, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Treasury stock reissued (in shares) | shares 722,423          
Shares issued price per share (in dollars per share) | $ / shares $ 32.43          
Treasury stock acquired average cost per share (in dollars per share) | $ / shares $ 3.37          
Loss on extinguishment of debt       $ (8,123,000) $ 0 $ 0
Issuance cost, equity component       6,000,000.0    
Income tax benefit, equity transaction       (6,200,000) (4,100,000)  
Current portion of long-term debt       666,000 630,000  
AccSys LLC (Restaurant Magic) | Subordinate Promissory Note            
Debt Instrument [Line Items]            
Stated interest rate   5.75%        
Liability, debt       1,400,000 2,000,000.0  
Acquisition by delivery of subordinate promissory note   $ 2,000,000.0        
Repayments of interest and principal amount   $ 100,000        
Current portion of long-term debt       700,000 700,000  
2021       700,000    
2022       700,000    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit agreement revolving loans     $ 25,000,000.0      
Convertible Senior Notes Due 2024            
Debt Instrument [Line Items]            
Implied estimated effective rate     10.20%      
Convertible Debt            
Debt Instrument [Line Items]            
Debt issued     $ 80,000,000.0 4,026,000 2,550,000  
Liability, debt       133,750,000    
2021       0    
2022       0    
Convertible Debt | Convertible Senior Notes Due 2024            
Debt Instrument [Line Items]            
Debt issued       13,750,000 80,000,000  
Stated interest rate     4.50%      
Common stock to repurchased $ 66,300,000          
Debt settlement amount 59,000,000.0          
Settlement of equity component 30,800,000          
Debt instrument pay off accrued interest 1,000,000.0          
Loss on extinguishment of debt 8,100,000          
Conversion ratio     0.0350217      
Liability, debt     $ 62,400,000      
Equity component of notes     $ 17,600,000      
Issuance costs       4,900,000    
Issuance costs, debt component       3,800,000    
Issuance cost, equity component       1,100,000    
Convertible Debt | Convertible Senior Notes Due 2026            
Debt Instrument [Line Items]            
Debt issued $ 120,000,000.0     120,000,000    
Stated interest rate 2.875%          
Implied estimated effective rate 7.30%          
Conversion ratio 0.0232722          
Liability, debt $ 93,800,000          
Equity component of notes $ 26,200,000          
Issuance costs       4,200,000    
Issuance costs, debt component       3,300,000    
Issuance cost, equity component       900,000    
Income tax benefit, equity transaction       $ 3,300,000 $ 4,100,000