Short and Long-Term Debt and Commitments Related to Letters of Credit Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt instrument [Line Items]
Committed under credit facility	$ 8,201
Revolving credit facility, current borrowing capacity	325,000
Revolving credit facility, maximum borrowing capacity	$ 425,000
Number of principal payments	5
Anniversary when principal payments begin	6
Debt Instrument, Annual Principal Payment	$ 10,000
Unused commitments under credit facility	180,760
Revolving credit facility, noncurrent	$ 141,616	$ 150,433
Long-term debt, weighted average interest rate	5.19%	3.14%
Long-term debt, fiscal year maturity [Abstract]
2024	$ 40,429
2025	19,846
2026	173,783
2027	45,000
2028	$ 45,000
Minimum [Member]
Debt instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.10%
Maximum [Member]
Debt instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.225%
Line of credit [Member]
Long-term debt, fiscal year maturity [Abstract]
Line of credit facility amount committed	$ 144,240
Letter of credit [Member]
Debt instrument [Line Items]
Letters of credit outstanding	$ 94,702	$ 94,435
Base rate, federal funds [Member] | Line of credit [Member]
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	0.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Line of credit [Member]
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	1.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Line of credit [Member] | Minimum [Member]
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	0.875%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Line of credit [Member] | Maximum [Member]
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	1.50%
Swing-line borrowings [Member]
Debt instrument [Line Items]
Revolving credit facility, current borrowing capacity	$ 30,000
Revolving credit facility, noncurrent	6,616	25,433
Line of credit [Member] | Letter of credit [Member]
Debt instrument [Line Items]
Letters of credit outstanding	2,389	2,122
3.99% Senior unsecured notes [Member]
Debt instrument [Line Items]
Senior unsecured notes	$ 50,000	50,000
Senior unsecured notes, interest rate	3.99%
Debt Instrument, Face Amount	$ 50,000
4.00% Senior unsecured notes [Member]
Debt instrument [Line Items]
Senior unsecured notes	$ 25,000	25,000
Senior unsecured notes, interest rate	4.00%
Unsecured debt additional shelf note capacity	$ 25,000
Revolving credit facility [Member] | Minimum [Member]
Debt instrument [Line Items]
Interest coverage ratio	3.00
Revolving credit facility [Member] | Maximum [Member]
Debt instrument [Line Items]
Ratio of Indebtedness to Net Capital	3.00
Revolving credit facility [Member] | Letter of credit [Member]
Debt instrument [Line Items]
Letters of credit outstanding	$ 2,624	2,624
Accounts receivable securitization [Member]
Debt instrument [Line Items]
Senior unsecured notes, interest rate	0.90%
Unused commitment fee threshold percent	0.50
Debt instrument variable rate base rate calculation, default rate	2.00%
Accounts receivable securitization [Member] | Letter of credit [Member]
Debt instrument [Line Items]
Revolving credit facility, current borrowing capacity	$ 90,000
Revolving credit facility, maximum borrowing capacity	150,000
Letters of credit outstanding	$ 89,689	89,689
Debt instrument, term (in years)	1 year
Accounts receivable securitization [Member] | Letter of credit [Member] | Minimum [Member]
Debt instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Accounts receivable securitization [Member] | Letter of credit [Member] | Maximum [Member]
Debt instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.45%
Accounts receivable securitization [Member] | Base rate, federal funds [Member]
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	0.50%
Accounts receivable securitization [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	0.10%
Long-term debt, fiscal year maturity [Abstract]
Debt Instrument, Interest Rate, Increase (Decrease)	1.00%
Debt Instrument, Interest Rate, Increase (Decrease)	1.00%
Unsecured Debt
Debt instrument [Line Items]
Debt Instrument, Face Amount	$ 75,000
Long-term debt, fiscal year maturity [Abstract]
Unsecured debt, current borrowing capacity	150,000
6.19% Senior unsecured notes
Debt instrument [Line Items]
Senior unsecured notes	$ 75,000	$ 0
Senior unsecured notes, interest rate	6.19%
Line of credit [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum [Member]
Debt instrument [Line Items]
Outstanding borrowings interest rate margin adjustment range	1.86%
Letter of credit [Member]
Debt instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 150,000
Line of credit [Member]
Debt instrument [Line Items]
Revolving credit facility, current borrowing capacity	11,133
Revolving credit facility, noncurrent	$ 543