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Debt (Narrative) (Details) - Credit Facility [Member]
6 Months Ended
Jun. 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   $ 135,000,000.0 $ 200,000,000.0  
Consolidated net leverage ratio decrease each quarter 0.25        
Line of credit, carrying value $ 130,000,000.0       $ 132,100,000
Debt issuance costs 3,100,000        
Line of credit, threshold of cash balance, payment required $ 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        
Debt instrument, effective rate 1.00%        
Maximum [Member]          
Debt Instrument [Line Items]          
Consolidated net leverage ratio 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        
Line of credit, commitment fee 0.50%        
Term Loan [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 130,000,000.0        
Debt instrument, effective rate 6.25%        
Debt outstanding balance $ 130,000,000        
Term Loan [Member] | Term Loan, Payment On July 15, 2020 [Member]          
Debt Instrument [Line Items]          
Principal payments (including interest) 7,500,000        
Term Loan [Member] | Term Loan, Payment Beginning August 15, 2020 [Member]          
Debt Instrument [Line Items]          
Principal payments (including interest) 2,500,000        
Term Loan [Member] | Term Loan, Payment Beginning In May 15, 2021 [Member]          
Debt Instrument [Line Items]          
Principal payments (including interest) 3,200,000        
Swing Line Loans [Member]          
Debt Instrument [Line Items]          
Debt outstanding balance $ 0        
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%