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DEBT - Facility Narrative (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 11, 2019
USD ($)
swap
Feb. 28, 2019
USD ($)
Dec. 28, 2018
USD ($)
swap
Oct. 30, 2018
USD ($)
Sep. 30, 2020
USD ($)
May 31, 2020
USD ($)
Oct. 31, 2018
USD ($)
extensionOption
Sep. 30, 2019
swap
Dec. 31, 2017
USD ($)
swap
Dec. 31, 2019
USD ($)
Aug. 13, 2015
USD ($)
Debt Instrument [Line Items]                      
Number of interest rate swaps terminated | swap 2   1         2 7    
Notional amount of terminated swaps $ 120,000,000   $ 50,000,000           $ 215,000,000    
Accrued interest and unused commitment fee payable         $ 576,000         $ 650,000  
Interest Rate Swap                      
Debt Instrument [Line Items]                      
Total notional amount                     $ 385,000,000
Interest Rate Swap | Cash Flow Hedges | Designated as Hedging Instrument                      
Debt Instrument [Line Items]                      
Total notional amount             $ 120,000,000        
Interest Rate Swap | Cash Flow Hedges | Designated as Hedging Instrument | Weighted Average                      
Debt Instrument [Line Items]                      
Converted fixed rate             3.11%        
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Interest rate         2.21%         3.29%  
Number of extension options | extensionOption             1        
Extension option, term             1 year        
Proceeds from issuance of debt       $ 170,000,000              
Revolving Credit Facility | Minimum                      
Debt Instrument [Line Items]                      
Unused commitment fee percentage             0.15%        
Revolving Credit Facility | Maximum                      
Debt Instrument [Line Items]                      
Unused commitment fee percentage             0.25%        
Revolving Credit Facility | Base rate | Debt Instrument, During, Deferral Period                      
Debt Instrument [Line Items]                      
Interest rate margin         1.05%            
Revolving Credit Facility | Base rate | Debt Instrument, Following, Deferral Period                      
Debt Instrument [Line Items]                      
Interest rate margin         0.55%            
Revolving Credit Facility | LIBOR | Debt Instrument, During, Deferral Period                      
Debt Instrument [Line Items]                      
Interest rate margin         2.05%            
Revolving Credit Facility | LIBOR | Debt Instrument, Following, Deferral Period                      
Debt Instrument [Line Items]                      
Interest rate margin         1.55%            
Line of Credit                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity         $ 209,500,000            
Line of Credit | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Repayments of debt $ 120,000,000 $ 10,000,000 $ 40,000,000                
Gross debt         166,500,000         $ 153,000,000  
Remaining borrowing capacity         28,000,000         73,900,000  
Reserve amount         15,000,000            
Minimum balance of liquid assets         15,000,000            
Unfunded availability (up to)         5,000,000            
Line of Credit | Revolving Credit Facility | Unsecured Revolving Credit Facility Due May 2022                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           $ 10,000,000          
Remaining borrowing capacity         10,000,000            
Fixed interest rate           1.00%          
Fee percentage for each advance made           1.12%          
Maximum fee amount payable           $ 112,000          
Debt outstanding         0            
Line of Credit | Revolving Credit Facility | Paycheck Protection Program Liquidity Facility, CARES Act                      
Debt Instrument [Line Items]                      
Gross debt         16,016,000         $ 0  
Debt outstanding         $ 16,016,000