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Debt (Details) - USD ($)
9 Months Ended 12 Months Ended
Jun. 19, 2020
Mar. 20, 2020
Mar. 19, 2020
Dec. 31, 2020
Dec. 31, 2020
Oct. 30, 2020
Jan. 19, 2020
Dec. 31, 2019
General corporate purposes                
Debt Instrument [Line Items]                
Proceeds from senior secured notes $ 244,400,000              
2018 Term loan                
Debt Instrument [Line Items]                
Loss on extinguishment of debt         $ 2,600,000      
Interest and Dividends Payable       $ 2,500,000 2,500,000      
2018 Revolving credit facility                
Debt Instrument [Line Items]                
Deferred debt issuance costs     $ 600,000          
Revolving credit facility                
Debt Instrument [Line Items]                
Commitment fees in interest expense         $ 400,000      
Revolving credit facility | 2018 Revolving credit facility                
Debt Instrument [Line Items]                
Credit facility borrowing capacity     $ 85,000,000          
Debt instrument term (years)     3 years          
Revolving credit facility | 2020 Revolving credit facility                
Debt Instrument [Line Items]                
Maximum debt-to-total capitalization (in percent)         35.00%      
Credit facility borrowing capacity   $ 100,000,000   $ 110,000,000 $ 110,000,000 $ 110,000,000    
Commitment fee (in percent)       0.35%        
Debt Issuance costs   $ 800,000            
Remaining deferred issuance costs, net of accumulated amortization       $ 1,100,000 1,100,000      
Revolving credit facility | 2020 Revolving credit facility | Minimum                
Debt Instrument [Line Items]                
Commitment fee (in percent)   0.175%            
Revolving credit facility | 2020 Revolving credit facility | Maximum                
Debt Instrument [Line Items]                
Commitment fee (in percent)   0.525%            
Revolving credit facility | 2020 Revolving credit facility | Base rate                
Debt Instrument [Line Items]                
Variable rate floor (in percent)   1.00%            
Revolving credit facility | 2020 Revolving credit facility | Base rate | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate (in percent)   0.375%            
Revolving credit facility | 2020 Revolving credit facility | Base rate | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate (in percent)   1.875%            
Revolving credit facility | 2020 Revolving credit facility | Eurodollar | Minimum                
Debt Instrument [Line Items]                
Basis spread on variable rate (in percent)   1.375%            
Revolving credit facility | 2020 Revolving credit facility | Eurodollar | Maximum                
Debt Instrument [Line Items]                
Basis spread on variable rate (in percent)   2.875%            
Senior debt                
Debt Instrument [Line Items]                
Debt instrument face amount $ 400,000,000     400,000,000 400,000,000      
Stated interest rate (in percent) 7.375%              
Applicable premium 1.00%              
Percent of aggregate balance redeemable with equity offerings 40.00%              
Deferred debt issuance costs $ 7,400,000     6,700,000 6,700,000      
Capitalized issuance cost and issue discounts       $ 6,700,000 $ 6,700,000      
Senior debt | Prior to March 1, 2025                
Debt Instrument [Line Items]                
Redemption price (in percent) 100.00%              
Senior debt | After March 1, 2025                
Debt Instrument [Line Items]                
Redemption price (in percent) 100.00%              
Senior debt | Prior to June 1, 2022                
Debt Instrument [Line Items]                
Redemption price (in percent) 107.375%              
Senior debt | 2018 Term loan                
Debt Instrument [Line Items]                
Debt instrument face amount             $ 150,000,000  
Deferred debt issuance costs               $ 2,000,000.0