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Debt (Narrative) (Details) - Credit Facility [Member]
3 Months Ended 9 Months Ended
Oct. 15, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
item
$ / shares
Dec. 31, 2021
Jun. 04, 2020
USD ($)
Jun. 03, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Debt Instrument, Maturity Date     Dec. 31, 2021        
Debt instrument, face amount         $ 135,000,000.0 $ 200,000,000.0  
Consolidated net leverage ratio decrease each quarter   0.25 0.25        
Line of credit, carrying value   $ 118,200,000 $ 118,200,000       $ 132,100,000
Debt issuance costs   2,800,000 2,800,000        
Line of credit, threshold of cash balance, payment required   $ 2,500,000 $ 2,500,000        
Line of credit, theshold cash balance, Number of days | item     5        
Line of credit, percent of net cash proceeds required for outstanding principal     100.00%        
Line of credit terms, maximum per unit quarterly payments | $ / shares     $ 0.12        
Scenario, Forecast [Member]              
Debt Instrument [Line Items]              
Consolidated net leverage ratio       1.50      
Minimum [Member]              
Debt Instrument [Line Items]              
Consolidated debt service coverage ratio   1.10 1.10        
Debt instrument, effective rate   1.00% 1.00%        
Maximum [Member]              
Debt Instrument [Line Items]              
Consolidated net leverage ratio   3.00 3.00        
LIBOR [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Interest rate, basis spread on variable rate, percentage     4.50%        
LIBOR [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Interest rate, basis spread on variable rate, percentage     5.25%        
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 5,000,000.0 $ 5,000,000.0        
Line of credit, commitment fee     0.50%        
Term Loan [Member]              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 130,000,000.0 $ 130,000,000.0        
Debt instrument, effective rate   6.00% 6.00%        
Debt instrument, required payments   $ 0 $ 0        
Debt Instrument, Date of First Required Payment     Oct. 15, 2020        
Payments on credit facility   12,500,000 $ 12,500,000        
Debt outstanding balance   $ 117,500,000 117,500,000        
Term Loan [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Principal payments $ 2,500,000            
Term Loan [Member] | Term Loan, Payment Beginning In May 15, 2021 [Member]              
Debt Instrument [Line Items]              
Periodic payments (including interest)     $ 3,200,000        
Swing Line Loans [Member]              
Debt Instrument [Line Items]              
Debt instrument, effective rate   7.25% 7.25%        
Debt outstanding balance   $ 700,000 $ 700,000        
Swing Line Loans [Member] | Prime Rate [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Interest rate, basis spread on variable rate, percentage     3.50%        
Swing Line Loans [Member] | Prime Rate [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Interest rate, basis spread on variable rate, percentage     4.25%