Long-Term Debt and Commitments Related to Letters of Credit (Narrative) (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Aug. 07, 2024 USD ($)	Jun. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Revolving credit facility, current borrowing capacity		$ 325,000
Revolving credit facility, maximum borrowing capacity		425,000
Unused commitments under credit facility		128,118
Revolving credit facility borrowings		$ 194,258	$ 141,616
Number of principal payments		5
Long-term debt, maturities, repayments of principal in next twelve months		$ 21,339
Long-Term Debt, Maturity, Year One		21,779
Long-term debt, maturities, repayments of principal in year two		228,478
Long-term debt, maturities, repayments of principal in year three		46,948
Long-term debt, maturities, repayments of principal in year four		45,175
Long-term debt, maturities, repayments of principal in year five		30
Long-term debt, maturities, repayments of principal after year five		$ 30
Anniversary when principal payments begin		6
Line of Credit Facility, Remaining Borrowing Capacity		$ 10,831
Subsequent event [Member]
Debt Instrument [Line Items]
Revolving credit facility, current borrowing capacity	$ 400,000
Revolving credit facility, maximum borrowing capacity	150,000
Debt Instrument, Adjustment To EBITDA, Maximum Amount	$ 55,000
Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage		0.10%
Minimum [Member] | Subsequent event [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%
Maximum [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.225%
Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Line of credit [Member]
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range		1.86%
Swing-line borrowings [Member]
Debt Instrument [Line Items]
Revolving credit facility, current borrowing capacity		$ 30,000
Revolving credit facility borrowings		$ 9,258	6,616
Swing-line borrowings [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Revolving credit facility, current borrowing capacity	$ 50,000
Revolving credit facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest coverage ratio		3.00
Revolving credit facility [Member] | Minimum [Member] | Subsequent event [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] | Maximum [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	3.25
3.99% Senior unsecured notes [Member]
Debt Instrument [Line Items]
Interest rate		3.99%
Debt Instrument, Face Amount		$ 50,000
Senior unsecured notes		$ 50,000	50,000
4.00% Senior unsecured notes [Member]
Debt Instrument [Line Items]
Interest rate		4.00%
Unsecured debt additional shelf note capacity		$ 25,000
Senior unsecured notes		$ 25,000	25,000
6.19% Senior unsecured notes
Debt Instrument [Line Items]
Interest rate		6.19%
Senior unsecured notes		$ 75,000	75,000
Unsecured debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		75,000
Senior unsecured notes		150,000	150,000
Unsecured debt, current borrowing capacity		$ 150,000
Accounts receivable securitization [Member]
Debt Instrument [Line Items]
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] | 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%
Outstanding borrowings, interest rate adjustment (Decrease)		1.00%
Line of credit [Member]
Debt Instrument [Line Items]
Line of credit facility amount committed		$ 196,882
Line of credit [Member] | Base Rate, Federal Funds [Member]
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range		0.50%
Line of credit [Member] | Base Rate, Federal Funds [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range	0.50%
Line of credit [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range		1.50%
Line of credit [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent event [Member]
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range	1.50%
Line of credit [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range		0.875%
Line of credit [Member] | Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent event [Member]
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range	0.875%
Line of credit [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range		1.50%
Line of credit [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent event [Member]
Debt Instrument [Line Items]
Outstanding borrowings interest rate margin adjustment, range	1.50%
Letter of credit [Member]
Debt Instrument [Line Items]
Letters of credit issued		$ 92,579	94,702
Letter of credit [Member] | Revolving credit facility [Member]
Debt Instrument [Line Items]
Letters of credit issued		2,624	2,624
Letter of credit [Member] | Accounts receivable securitization [Member]
Debt Instrument [Line Items]
Revolving credit facility, current borrowing capacity		90,000	90,000
Revolving credit facility, maximum borrowing capacity		150,000
Letters of credit issued		$ 89,689	89,689
Letter of credit [Member] | Accounts receivable securitization [Member] | Subsequent event [Member]
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 125,000
Debt instrument, term	1 year
Letter of credit [Member] | Accounts receivable securitization [Member] | Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage		0.35%
Letter of credit [Member] | Accounts receivable securitization [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage		0.45%
Letter of credit [Member] | Line of credit [Member]
Debt Instrument [Line Items]
Letters of credit issued		$ 266	$ 2,389
Letter of credit [Member]
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity		150,000
Letter of credit [Member] | Subsequent event [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		11,097
Revolving credit facility borrowings		$ 0