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Fair Value Measurement (Financial Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Carrying Value
Financial assets:
Other assets	$ 34,824	$ 33,231
Financial liabilities:
Other liabilities	33,548	32,043
Carrying Value | Revolving Credit Facility
Financial liabilities:
Senior notes due 2023	125,000	125,000
Carrying Value | Term Loan
Financial liabilities:
Senior notes due 2023	125,000	125,000
Carrying Value | Contribution Certificates
Financial liabilities:
Contribution Certificates	179,865	179,387
Carrying Value | BOLI
Financial assets:
Short-term and other investments	78,657	78,205
Carrying Value | Other investments
Financial assets:
Short-term and other investments	4,064	3,215
Fair Value
Financial assets:
Other assets	34,824	33,221
Financial liabilities:
Other liabilities	33,548	32,043
Fair Value | Revolving Credit Facility
Financial liabilities:
Senior notes due 2023	125,000	125,000
Fair Value | Term Loan
Financial liabilities:
Senior notes due 2023	125,000	125,000
Fair Value | Contribution Certificates
Financial liabilities:
Contribution Certificates	147,328	149,782
Fair Value | BOLI
Financial assets:
Short-term and other investments	78,657	78,205
Fair Value | Other investments
Financial assets:
Short-term and other investments	$ 4,064	$ 3,215

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Topic 470
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-Name Accounting Standards Codification
-Section 55
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-Topic 820
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