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Note 9 - Other Assets Components of Other Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Prepaid federal income taxes (Note 10) |  | $ 134,800 |  | $ 0 |
Company-owned life insurance |  | 105,721 |  | 83,377 |
Loaned securities |  | 66,442 |  | 27,860 |
Internal-use software | [1] | 58,356 |  | 51,367 |
Right-of-use assets | [4] | 37,866 | [2],[3] | 0 |
Accrued investment income |  | 32,333 |  | 34,878 |
Property and equipment | [5] | 29,523 |  | 37,090 |
Assets held for sale | [6] | 24,908 |  | 0 |
Deferred policy acquisition costs |  | 20,759 |  | 17,311 |
Reinsurance recoverables |  | 16,976 |  | 14,402 |
Unbilled receivables |  | 13,772 |  | 19,917 |
Current federal income tax receivable | [7] | 0 |  | 44,506 |
Other |  | 26,163 |  | 36,992 |
Total other assets |  | 567,619 |  | 367,700 |
Internal-use software, accumulated amortization |  | 73,500 |  | 60,300 |
Impairments of internal-use software |  | 3,800 |  | 5,100 |
Amortization expense |  | 13,000 |  | 11,400 | $ 10,700
Accumulated Amortization, Right-of-Use Assets |  | 8,500 |  |  |
Property and equipment, accumulated depreciation |  | 68,400 |  | 62,900 |
Depreciation expense |  | $ 7,800 |  | 8,000 | $ 6,900
Internal Revenue Service (IRS) |  |  |  |  |
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Refunded |  |  |  | $ 57,200 |
[1] | Internal-use software, at cost, has been reduced by accumulated amortization of $73.5 million and $60.3 million at December 31, 2019 and 2018, respectively, as well as $3.8 million of impairment charges in 2019 and $5.1 million of impairment charges in 2018. Amortization expense was $13.0 million, $11.4 million and $10.7 million for the years ended December 31, 2019, 2018 and 2017, respectively.
[2] | Classified in other assets in our consolidated balance sheets. See Note 9.
[3] | Operating lease right-of-use assets and liabilities of $2.6 million and $3.8 million, respectively, are classified as held for sale and are excluded from the amounts in this disclosure.
[4] | Represents right-of-use assets recognized as a result of our adoption, as of January 1, 2019, of the new accounting and disclosure requirements for leases of property, plant and equipment. See Note 2 for additional information. Right-of-use assets are shown less accumulated amortization of $8.5 million at December 31, 2019.
[5] | Property and equipment at cost, less accumulated depreciation of $68.4 million and $62.9 million at December 31, 2019 and 2018, respectively. Depreciation expense was $7.8 million, $8.0 million and $6.9 million for the years ended December 31, 2019, 2018 and 2017, respectively.
[6] | Related to the sale of Clayton. See Notes 4 and 7 for additional information on assets held for sale. Liabilities held for sale at December 31, 2019 are included in other liabilities on our consolidated balance sheets.
[7] | During the year ended December 31, 2019, current federal income tax receivable was reduced by our receipt of the remaining $57.2 million refund from amounts on deposit with the IRS related to the settlement of the IRS Matter.

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