Fair Value Measurement (Financial Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Carrying Value
Financial assets:
Other assets	$ 35,070	$ 33,231
Financial liabilities:
Other liabilities	34,051	32,043
Carrying Value \| Revolving Credit Facility
Financial liabilities:
Revolving Credit Agreement and Term Loan	125,000	125,000
Carrying Value \| Term Loan
Financial liabilities:
Revolving Credit Agreement and Term Loan	121,875	125,000
Carrying Value \| Contribution Certificates
Financial liabilities:
Contribution Certificates	180,834	179,387
Carrying Value \| BOLI
Financial assets:
Short-term and other investments	80,292	78,205
Carrying Value \| Other investments
Financial assets:
Short-term and other investments	4,076	3,215
Fair Value
Financial assets:
Other assets	35,070	33,221
Financial liabilities:
Other liabilities	34,051	32,043
Fair Value \| Revolving Credit Facility
Financial liabilities:
Revolving Credit Agreement and Term Loan	125,000	125,000
Fair Value \| Term Loan
Financial liabilities:
Revolving Credit Agreement and Term Loan	121,875	125,000
Fair Value \| Contribution Certificates
Financial liabilities:
Contribution Certificates	159,059	149,782
Fair Value \| BOLI
Financial assets:
Short-term and other investments	80,292	78,205
Fair Value \| Other investments
Financial assets:
Short-term and other investments	$ 4,076	$ 3,215