Contractual interest rate for funds borrowed, under the debt agreement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Debt (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Debt (Narrative) (Details) - USD ($)	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Loss on debt redemption/refinancing	$ 0	$ 3,193,000	$ 4,993,000	$ 55,576,000
Federal Home Loan Bank Certificates and Obligations (FHLB)
Debt Instrument [Line Items]
Payments to acquire investments			1,000,000
Interest rate swaps
Debt Instrument [Line Items]
Derivative notional amount	$ 200,000,000		$ 200,000,000
Fixed interest rate	0.56%		0.56%
Line of credit \| Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000		$ 500,000,000
Outstanding borrowings	$ 0		0
Notes due April 2023 \| Notes due
Debt Instrument [Line Items]
Loss on debt redemption/refinancing			$ 5,000,000
Interest rate	6.20%		6.20%
Term Loan Due 2026 and Term Loan Due 2028 \| Notes due
Debt Instrument [Line Items]
Repayments of debt			$ 18,000,000
Term loan due March 2026 \| Notes due
Debt Instrument [Line Items]
Interest rate	4.90%		4.90%
Term loan due March 2028 \| Notes due
Debt Instrument [Line Items]
Interest rate	7.10%		7.10%