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Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 15, 2021 | Jun. 09, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Notes payable aggregate principal amount |  |  | $ 253,885 |
Loss on extinguishment of debt |  |  | $ 4,165 |
Other long-term debt maturity year |  |  | 2050 |
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable redemption start date | Jun. 15, 2021 |  |  |
Notes payable interest rate | 5.95% |  |  |
Notes payable aggregate principal amount | $ 150,000 |  |  |
Notes payable redeemed principal plus accrued and unpaid interest rate | 100.00% |  |  |
Loss on extinguishment of debt | $ 4,200 |  |  |
Subordinated Notes [Member] | Subordinated Notes Payable, Maturing June 2060 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable redemption start date |  | Jun. 15, 2025 |  |
Notes payable interest rate |  | 6.25% |  |
Notes payable aggregate principal amount |  | $ 172,500 | $ 172,500 | $ 172,500
Notes payable issuance date |  | Jun. 09, 2020 |  |
Notes payable maturity date |  | Jun. 15, 2060 |  |
Notes payable beginning payment date |  | Sep. 15, 2020 |  |
Other Long-Term Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notes payable aggregate principal amount |  |  | $ 81,385 | $ 66,062
Notes payable agreement period |  |  | 7 years |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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