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Note 9 - Other Assets - Components of Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Other Assets [Abstract] |  |
Prepaid federal income taxes (Note 10) | $ 191,889 | $ 134,800
Company-owned life insurance | 112,311 | 105,721
Reinsurance recoverables | 66,515 | 16,976
Internal-use software (net of accumulated amortization of $80,060 and $73,498) | 61,549 | 58,356
Loaned securities (Note 5) | 57,922 | 66,442
Accrued investment income | 36,093 | 32,333
Right-of-use assets | 34,662 | 37,866
Property and equipment (net of accumulated depreciation of $70,519 and $68,436) | 27,168 | 29,523
Deferred policy acquisition costs | 17,926 | 20,759
Unbilled receivables | 8,581 | 13,772
Assets held for sale | 0 | 24,908
Other Assets, Miscellaneous | 26,214 | 26,163
Other Assets | 640,830 | 567,619
Accumulated amortization | 80,060 | 73,498
Accumulated depreciation | $ 70,519 | $ 68,436

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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