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Debt (Details Textual) - USD ($)
May 28, 2020
Mar. 23, 2016
Mar. 31, 2021
Dec. 31, 2020
Debt [Line Items]        
Amount outstanding under the line of credit     $ 20,000,000 $ 0
Prime Rate | Minimum        
Debt [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.75%      
Prime Rate | Maximum        
Debt [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.25%      
Non-Prime Rate | Minimum        
Debt [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.50%      
Non-Prime Rate | Maximum        
Debt [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.00%      
6.50% Notes due 2024        
Debt [Line Items]        
Interest rate, stated percentage     7.50%  
Senior Notes | 6.50% Notes due 2024        
Debt [Line Items]        
Aggregate principal amount   $ 900,000,000    
Percentage of redemption price, change in ownership controllatest for redemption at face amount   101.00%    
Percentage of redemption price, redemption date, latest for redemption at face amounttion Price, Redemption Date, Latest For Redemption At Face Amount   100.00%    
Line of Credit [Member]        
Debt [Line Items]        
Maximum borrowing capacity     $ 211,500,000  
Letter of Credit        
Debt [Line Items]        
Maximum borrowing capacity     $ 19,151,000 $ 18,651,000