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Debt - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 20, 2020
Mar. 19, 2020
May 24, 2018
Mar. 31, 2020
Mar. 31, 2019
Debt Instrument [Line Items]            
Term loan $ 147,375,000       $ 147,375,000  
Interest expense         $ 2,744,000 $ 3,061,000
2015 Term Loan            
Debt Instrument [Line Items]            
Debt instrument face amount       $ 150,000,000    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt issuance costs   $ 800,000        
Revolving Credit Facility | 2018 Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument term (years)       3 years    
Credit facility borrowing capacity     $ 85,000,000 $ 85,000,000    
Debt instrument covenant, maximum debt-to-total capitalization ratio         35.00%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Commitment fee (percent)     0.30%      
Revolving Credit Facility | 2018 Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Commitment fee (percent)     0.60%      
Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)     2.00%      
Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)     3.50%      
Revolving Credit Facility | 2020 Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit facility borrowing capacity   $ 100,000,000        
Borrowings outstanding 0       $ 0  
Commitment fee (percent)         0.35%  
Commitment fees in interest expense         $ 100,000  
Interest expense from amortization of debt issuance costs         100,000  
Remaining deferred issuance costs, net of accumulated amortization $ 1,400,000       $ 1,400,000  
Revolving Credit Facility | 2020 Revolving Credit Facility | Minimum            
Debt Instrument [Line Items]            
Commitment fee (percent) 0.175%          
Revolving Credit Facility | 2020 Revolving Credit Facility | Maximum            
Debt Instrument [Line Items]            
Commitment fee (percent) 0.525%          
Revolving Credit Facility | 2020 Revolving Credit Facility | Base Rate            
Debt Instrument [Line Items]            
Variable rate floor (percent)         1.00%  
Revolving Credit Facility | 2020 Revolving Credit Facility | Base Rate | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   0.375%        
Revolving Credit Facility | 2020 Revolving Credit Facility | Base Rate | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   1.875%        
Revolving Credit Facility | 2020 Revolving Credit Facility | Eurodollar            
Debt Instrument [Line Items]            
Variable rate floor (percent)   0.00%        
Revolving Credit Facility | 2020 Revolving Credit Facility | Eurodollar | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   1.375%        
Revolving Credit Facility | 2020 Revolving Credit Facility | Eurodollar | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   2.875%        
2018 Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt issuance costs $ 600,000       $ 600,000  
2018 Revolving Credit Facility | 2020 Revolving Credit Facility | Base Rate | Minimum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)     1.00%      
2018 Revolving Credit Facility | 2020 Revolving Credit Facility | Base Rate | Maximum            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)     2.50%      
Secured Debt | 2018 Term Loan            
Debt Instrument [Line Items]            
Debt instrument face amount       $ 150,000,000    
Debt instrument term (years)       5 years    
Interest rate during period (percent)         5.75%  
Frequency of periodic payment         Quarterly  
Periodic payment of principal         $ 400,000  
Interest expense         2,500,000  
Unamortized issuance costs and original issue discount $ 1,900,000       $ 1,900,000  
Debt instrument covenant, maximum debt-to-total capitalization ratio         35.00%  
Secured Debt | 2018 Term Loan | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable rate floor (percent)         1.00%  
Basis spread on variable rate (percent)           4.75%