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Short-Term Borrowings (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 28, 2021
Mar. 31, 2022
Dec. 31, 2021
Short-term Debt [Line Items]      
Ratio of Indebtedness to Net Capital   0.65  
Notional Amount of Nonderivative Instruments $ 40,000,000 $ 30,000,000  
Line of Credit Facility, Remaining Borrowing Capacity   256,300,000  
Short-term borrowing   $ 140,865,000 $ 221,634,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time   1.17% 0.83%
Draws on letters of credit   $ 5,300,000  
Financing Receivable, Revolving   400,000,000  
Revolving Line of Credit, Short-term      
Short-term Debt [Line Items]      
Financing Receivable, Revolving   $ 200,000,000  
Debt Instrument, Interest Rate, Stated Percentage   70.00%  
Revolving Line of Credit, Long-term      
Short-term Debt [Line Items]      
Financing Receivable, Revolving   $ 200,000,000  
Debt Instrument, Fee   0.09  
Debt Instrument, Interest Rate, Stated Percentage   95.00%  
3.48% note, due May 31, 2038 [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.48%  
Committed Line of Credit Facility Two [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 0.75 percent  
Committed Line of Credit Facility Three [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   Lender's base rate, plus 0.75 percent  
Committed Line of Credit Facility Five [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   Lender's base rate, plus 0.85 percent  
Committed Line of Credit Facility Four [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 1.125 percent  
Committed Line of Credit Facility Six [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 1.75 percent  
Committed Line of Credit Facility Seven [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 1.75 percent  
Committed Line of Credit Facility Eight [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 1.75 percent  
Committed Line of Credit Facility Nine [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 1.75 percent  
Committed Line of Credit Facility One [Member]      
Short-term Debt [Line Items]      
Debt Instrument, Description of Variable Rate Basis   LIBOR rate, plus 0.75 percent  
Revolving Credit Facility      
Short-term Debt [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 400,000,000  
Interest Rate Swap Rate, Low Range [Member]      
Short-term Debt [Line Items]      
Fixed Swap Rate     0.20%
Interest Rate Swap Rate, High Range [Member]      
Short-term Debt [Line Items]      
Fixed Swap Rate   0.17% 0.205%