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Bank Debt (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 15, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
May 21, 2018
Debt Instrument [Line Items]            
Amortization of debt issuance costs   $ 467 $ 543      
Leverage ratio   293.00%        
Debt service coverage ratio   148.00%        
Credit Agreement [Member]            
Debt Instrument [Line Items]            
Capital expenditures limit under credit agreement   $ 30,000        
Deferred financing costs expensed   6,000   $ 6,500    
Credit agreement, amount outstanding   168,000        
Debt issuance costs         $ 7,200  
Borrowing capacity   47,500   $ 4,200    
Liquidity   $ 55,400        
Leverage ratio threshold   200.00%        
Debt, interest rate spread on variable rate   3.50%        
Interest rate effective percentage   6.42%        
Minimum [Member] | Credit Agreement [Member] | Through December 31, 2021 [Member]            
Debt Instrument [Line Items]            
Debt service coverage ratio   105.00%        
Minimum [Member] | Credit Agreement [Member] | After December 31, 2021 [Member]            
Debt Instrument [Line Items]            
Debt service coverage ratio   125.00%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Debt, interest rate spread on variable rate   2.75%        
Debt instrument, variable rate floor   0.50%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Debt, interest rate spread on variable rate   4.00%        
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Amount of debt with maximum interest rate   $ 53,000        
Revolving Credit Facility [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Credit agreement, amount outstanding   72,000       $ 120,000
Term Loan [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Credit agreement, amount outstanding   $ 96,000        
Subsequent Event [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Debt issuance costs $ 1,900          
Interest rate effective percentage 6.92%          
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member]            
Debt Instrument [Line Items]            
Debt, interest rate spread on variable rate 4.00%