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Debt (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 08, 2019
Jul. 31, 2017
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Debt          
Purchase price of a commercial building   $ 1,900,000      
Fixed interest rate   4.35%      
Amortization schedule   25 years      
Balloon payment   10 years      
Net discount on debt and deferred financing fees       $ 5,416,000 $ 5,688,000
Long-term Debt, Total       327,681,000 253,624,000
Less current maturities of long-term debt       (2,249,000) (2,248,000)
Long-term debt, less current installments       325,432,000 251,376,000
Future maturities of long-term debt          
Remainder of 2020       1,686,000  
2021       2,250,000  
2022       2,253,000  
2023       29,755,000  
2024       2,257,000  
Thereafter       294,896,000  
Debt issuance costs     $ 50,000    
Debt issuance costs       0  
Revolving credit facility          
Debt          
Maximum borrowing capacity $ 125,000,000        
Outstanding balance       84,346,000 10,000,000
Revolving credit facility | Minimum          
Debt          
Unused facility fee (as a percent) 0.375%        
Revolving credit facility | Maximum          
Debt          
Unused facility fee (as a percent) 0.50%        
Term loans          
Debt          
Outstanding balance       219,450,000 220,000,000
Future maturities of long-term debt          
Debt issuance costs     0    
Mortgage          
Debt          
Mortgage       1,801,000 1,812,000
A&R Term Loan Credit Agreement          
Debt          
Maximum borrowing capacity $ 220,000,000        
Variable interest rate, basis points spread over variable reference rate (as a percent) 4.50%        
Future maturities of long-term debt          
Debt issuance costs     $ 100,000    
Contingent notes          
Debt          
Outstanding balance       10,000,000  
Earned Contingent Note          
Debt          
Contingent notes       $ 27,500,000  
Fixed interest rate       6.75%  
Long-term Debt, Total       $ 27,500,000 $ 27,500,000
Guaranteed note          
Debt          
Outstanding balance       7,500,000  
Long-term Debt, Total       10,000,000  
Amended Credit Agreement          
Debt          
Outstanding balance       $ 84,300,000  
Weighted average interest rate       3.10%