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Debt - A&R (Details) - USD ($)
1 Months Ended 6 Months Ended
May 14, 2020
Jul. 08, 2019
May 31, 2020
Jul. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
May 19, 2020
Dec. 31, 2019
Debt                
Aggregate principal amount             $ 143,800,000  
Contingent notes             $ 194,400,000  
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         $ 61,345,000     $ 5,688,000
Long-term Debt, Total         360,044,000     253,624,000
Less current maturities of long-term debt         (2,249,000)     (2,248,000)
Long-term debt, less current installments         357,795,000     251,376,000
Future maturities of long-term debt                
Remainder of 2020         1,124,000      
2021         2,250,000      
2022         2,253,000      
2023         29,755,000      
2024         2,257,000      
Thereafter         383,750,000      
Debt issuance costs     $ 5,800,000   275,000 $ 50,000    
Debt Issuance Costs Recorded To Additional Paid In Capital     2,200,000          
Net Debt Issuance Costs Net Carrying Value     $ 3,700,000          
Convertible Notes [Member]                
Debt                
Outstanding balance         143,750,000      
Revolving credit facility                
Debt                
Maximum borrowing capacity   $ 125,000,000            
Outstanding balance         30,000,000     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         218,350,000     220,000,000
Future maturities of long-term debt                
Debt issuance costs           0    
Mortgage                
Debt                
Mortgage         1,789,000     1,812,000
A&R Term Loan Credit Agreement                
Debt                
Maximum borrowing capacity   $ 220,000,000.0            
Variable interest rate, basis points spread over variable reference rate (as a percent)   4.50%            
Future maturities of long-term debt                
Debt issuance costs         300,000 $ 100,000    
A&R Term Loan Credit Agreement | Euro dollar                
Debt                
Unused facility fee (as a percent) 1.00%              
Contingent notes                
Debt                
Outstanding balance         10,000,000.0      
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         10,000,000.0      
Amended Credit Agreement                
Debt                
Outstanding balance         $ 30,000,000.0      
Weighted average interest rate         2.30%