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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%

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