Debt (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 29, 2029	Dec. 28, 2028	Aug. 08, 2026	Aug. 08, 2025	Dec. 31, 2023	Dec. 09, 2022	Jul. 30, 2015
Debt Instrument [Line Items]
Document Period End Date	Sep. 30, 2024
Payments of Debt Issuance Costs	$ 0	$ 73,000
Costs associated with amendment	1,718,000						$ 2,328,000
Line of Credit Facility, Remaining Borrowing Capacity	35,000,000.0
Senior unsecured notes, net	298,994,000						336,207,000
Letters of Credit Outstanding, Amount	16,800,000						13,500,000
Notes payable	0						12,981,000
Debt Instrument, Interest Rate, Stated Percentage									3.15%
2026 Notes
Debt Instrument [Line Items]
Senior unsecured notes, net	62,500,000						75,000,000
2027 Notes
Debt Instrument [Line Items]
Senior unsecured notes, net	37,500,000						37,500,000
2028 Notes
Debt Instrument [Line Items]
Senior unsecured notes, net	100,000,000						125,000,000
2029 Notes
Debt Instrument [Line Items]
Senior unsecured notes, net	100,000,000						100,000,000
Senior Notes
Debt Instrument [Line Items]
Costs associated with amendment	1,006,000						1,293,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 300,000,000	$ 35,000,000.0
Borrowings on lines of credit	$ 0						$ 0
Forecast [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five			$ 70,000,000
Long-Term Debt, Maturity, Year Two						$ 12,500,000
Long-Term Debt, Maturity, Year Three					$ 50,000,000.0
Long-Term Debt, Maturity, Year Five				$ 30