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Debt (Details)
3 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Oct. 30, 2018
USD ($)
covenant
Mar. 31, 2019
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2019
USD ($)
period
Sep. 30, 2020
USD ($)
period
Dec. 31, 2019
USD ($)
Apr. 01, 2019
USD ($)
Dec. 31, 2018
Apr. 01, 2010
Swap_Agreements
Debt Instrument [Line Items]                  
Repayment of remaining balance $ 17,225                
Term note | Senior Credit Facility | Minimum | Eurodollar                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.50%                
Term note | Senior Credit Facility | Minimum | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 0.50%                
Term note | Senior Credit Facility | Maximum | Eurodollar                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 2.375%                
Term note | Senior Credit Facility | Maximum | Base Rate                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate 1.375%                
Term note | Senior Credit Facility | Term note                  
Debt Instrument [Line Items]                  
Consolidated fixed charge coverage ratio 1.25                
Term note | Senior Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, current borrowing capacity $ 20,000                
Line of credit facility, amount outstanding 5,000                
Remaining balance available for borrowing 15,000                
Term note | Senior Credit Facility | 2018 Term Notes                  
Debt Instrument [Line Items]                  
Line of credit facility, current borrowing capacity $ 42,500                
Net cash proceeds from dispositions to the extent not reinvested 100.00%                
Net cash proceeds from stated equity issuances 50.00%                
Net cash proceeds from certain receipts above certain thresholds 100.00%                
Term note | Senior Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Line of credit facility, current borrowing capacity $ 22,500                
Security interest pledge 65.00%                
Mortgages | Mortgage Loan On Headquarters Facility                  
Debt Instrument [Line Items]                  
Term of debt instrument   10 years              
Principal repayment   $ 15,000              
Debt instrument, face amount   $ 4,000,000              
Debt instrument, maturity term   20 years              
Number of Interest rate swap agreements | Swap_Agreements                 2
Mortgages | Mortgage Loan On Headquarters Facility | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Debt instrument, basis spread on variable rate   2.00%              
Scenario, Forecast | Term note | Senior Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, current borrowing capacity           $ 15,000      
Scenario, Forecast | Term note | Senior Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Principal repayment     $ 844 $ 563 $ 703        
Number of three-month periods, frequency of payment | period       4 4        
Scenario, Forecast | Mortgages | Mortgage Loan On Headquarters Facility                  
Debt Instrument [Line Items]                  
Balloon payment             $ 2,551,000    
Debt Covenant Period, One | Term note | Senior Credit Facility | Term note                  
Debt Instrument [Line Items]                  
Number of financial covenants | covenant 2                
Consolidated leverage ratio 3.00                
Debt Covenant Period, Two | Term note | Senior Credit Facility | Term note                  
Debt Instrument [Line Items]                  
Consolidated leverage ratio 2.75                
Debt Covenant Period, Three | Term note | Senior Credit Facility | Term note                  
Debt Instrument [Line Items]                  
Consolidated leverage ratio 2.50                
Debt Covenant Period, Four | Term note | Senior Credit Facility | Term note                  
Debt Instrument [Line Items]                  
Consolidated leverage ratio 2.00                
Debt Instrument, Redemption, Period One | Mortgages | Mortgage Loan On Headquarters Facility                  
Debt Instrument [Line Items]                  
Strike rate               5.91% 5.91%
Debt Instrument, Redemption, Period Two | Mortgages | Mortgage Loan On Headquarters Facility                  
Debt Instrument [Line Items]                  
Strike rate               6.07% 6.07%