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Borrowings - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Jun. 01, 2012 | Jan. 31, 2010 | Dec. 31, 2023 | Dec. 31, 2022 | Oct. 12, 2023 | Oct. 11, 2023 | Sep. 30, 2023 | Oct. 13, 2022
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt, net |  |  |  | $ 13,000 | $ 515,000 |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Total outstanding borrowings of unconsolidated entities |  |  |  | 974,644,000 |  |  |  | $ 978,028,000 |
Senior Notes |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Total outstanding borrowings of unconsolidated entities |  |  |  | 899,791,000 |  |  |  | 903,691,000 |
6.750% | Senior Notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | 4,300,000 |  |  |  |  |
Loss on extinguishment of debt, net |  |  |  | 100,000 |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Total outstanding borrowings of unconsolidated entities |  |  |  | 197,915,000 |  |  |  | 202,195,000 |
5.875% | Senior Notes |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Total outstanding borrowings of unconsolidated entities |  |  |  | 357,255,000 |  |  |  | 357,255,000 |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principle balance of notes |  |  |  | $ 100,800,000 |  |  |  |  |
Weighted average fixed interest rate of debt |  |  |  | 8.10% |  |  |  |  |
Junior Subordinated Debt, Modified Terms |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  | $ 75,000,000 |  |  |  |  |  |
Redemption price percentage |  | 75.00% |  |  |  |  |  |  |
Annual increase of percentage of principal amount redeemable | 1.785% |  |  |  |  |  |  |  |
Junior Subordinated Debt, Modified Terms | LIBOR |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Variable rate floor |  |  | 4.25% |  |  |  |  |  |
Variable rate cap |  |  | 9.25% |  |  |  |  |  |
Junior Subordinated Debt, Original Terms |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  | $ 25,800,000 |  |  |  |  |
Junior Subordinated Debt, Original Terms | LIBOR |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.71% | 2.45% |  |  |  |  |
Senior Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 400,000,000
Credit facility, available increase in borrowing capacity |  |  |  |  |  |  |  |  | $ 100,000,000
Senior Unsecured Revolving Credit Facility |  |  |  | $ 0 |  |  |  | 0 |
Letters of credit secured using cash collateral |  |  |  | 0 |  |  |  |  |
Amount of available borrowings under the secured revolving credit facility |  |  |  | 300,000,000 |  |  |  |  |
Senior Unsecured Revolving Credit Facility | Senior Notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 300,000,000 | $ 265,000,000 |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  |  | $ 36,700,000 |  |  |  | $ 31,200,000 |
Letter of Credit | Senior Notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 100,000,000 |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph e -SubTopic 470 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480848/942-470-50-3 + Details
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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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