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Senior Notes (Details) - USD ($)
3 Months Ended
May 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]        
Repayments of Long-term Lines of Credit   $ 34,068,000 $ 33,000,000  
Accumulated Amortization, Debt Premium   279,000   $ 221,000
Accumulated Amortization, Debt Issuance Costs   937,000   819,000
Accretion of debt discount, net of debt premium on senior notes   80,000 75,000  
Credit Facility amortization of debt issuance costs   $ 193,000 $ 200,000  
Redemption period   180 days    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term     62 months  
Principal amount   $ 400,000,000   400,000,000
Accumulated amortization, debt discount   1,431,000   1,293,000
Accumulated Amortization, Debt Issuance Costs   570,000   $ 496,000
Long-term Debt, Fair Value   417,600,000    
Acquisition debt imputed interest expense   6,625,000 $ 6,625,000  
Credit Facility amortization of debt issuance costs   $ 74,000 67,000  
Senior Notes [Member] | Period One        
Debt Instrument [Line Items]        
Redemption price percentage 100.00%      
Percentage of principal amount redeemed 40.00%      
Senior Notes [Member] | Period Two        
Debt Instrument [Line Items]        
Redemption price percentage 106.625%      
Percentage of principal amount redeemed 60.00%      
Senior Notes [Member] | Period Three        
Debt Instrument [Line Items]        
Redemption price percentage 101.00%      
Senior Notes [Member] | Period Four        
Debt Instrument [Line Items]        
Redemption price percentage 100.00%      
Senior Notes [Member] | Senior Note One [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate During Period   6.69%    
Debt Instrument, Discount Rate   6.87%    
Accretion of debt discount, net of debt premium on senior notes   $ 138,000 129,000  
Senior Notes [Member] | Senior Note Two [Member]        
Debt Instrument [Line Items]        
Stated interest rate percentage   6.625%    
Debt Instrument, Interest Rate During Period   6.88%    
Debt Instrument, Discount Rate   6.20%    
Accretion of debt discount, net of debt premium on senior notes   $ 58,000 $ 54,000