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Note 8 - Other Assets Components of Other Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Company-owned life insurance |  | $ 103,877 |  |  | $ 103,877 |  |  | $ 83,377
Prepaid federal income taxes (Note 9) |  | 89,200 |  |  | 89,200 |  |  | 0
Loaned securities (Note 5) |  | 65,444 |  |  | 65,444 |  |  | 27,860
Internal-use software | [1] | 55,190 |  |  | 55,190 |  |  | 51,367
Right-of-use assets | [3] | 42,613 | [2] |  | 42,613 | [2] |  | 0
Property and equipment | [4] | 34,339 |  |  | 34,339 |  |  | 37,090
Accrued investment income |  | 33,187 |  |  | 33,187 |  |  | 34,878
Unbilled receivables |  | 25,110 |  |  | 25,110 |  |  | 19,917
Deferred policy acquisition costs |  | 19,928 |  |  | 19,928 |  |  | 17,311
Reinsurance recoverables |  | 16,906 |  |  | 16,906 |  |  | 14,402
Current federal income tax receivable | [5] | 0 |  |  | 0 |  |  | 44,506
Other |  | 27,853 |  |  | 27,853 |  |  | 36,992
Total other assets |  | 513,647 |  |  | 513,647 |  |  | 367,700
Internal-use software, Accumulated Amortization |  | 70,400 |  |  | 70,400 |  |  | 60,300
Internal-use software, Impairments |  |  |  |  | 3,800 |  |  | 5,100
Internal-use software, Amortization |  | 3,300 |  | $ 2,900 | 9,800 |  | $ 8,600 |
Accumulated Amortization, Right-of-Use Assets |  | 6,800 |  |  | 6,800 |  |  |
Property and Equipment, Owned, Accumulated Depreciation |  | 68,500 |  |  | 68,500 |  |  | 62,900
Depreciation expense |  | $ 1,900 |  | $ 2,100 | $ 5,900 |  | $ 5,900 |
REMIC Residual | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Refund of Qualified Deposit Assets from U.S. Department of Treasury |  |  |  |  |  |  |  | $ 57,200
[1] | Internal-use software, at cost, has been reduced by accumulated amortization of $70.4 million and $60.3 million at September 30, 2019 and December 31, 2018, respectively, as well as $3.8 million of impairment charges in the nine months ended September 30, 2019, and $5.1 million of impairment charges in 2018. Amortization expense was $3.3 million and $2.9 million for the three-month periods ended September 30, 2019 and 2018, respectively, and $9.8 million and $8.6 million for the nine-month periods ended September 30, 2019 and 2018, respectively.
[2] | Classified in other assets in our condensed consolidated balance sheets. See Note 8.
[3] | 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 1 for additional information. Right-of-use assets are shown less accumulated amortization of $6.8 million at September 30, 2019.
[4] | Property and equipment at cost, less accumulated depreciation of $68.5 million and $62.9 million at September 30, 2019 and December 31, 2018, respectively. Depreciation expense was $1.9 million and $2.1 million for the three-month periods ended September 30, 2019 and 2018, respectively, and $5.9 million for both the nine-month periods ended September 30, 2019 and 2018.
[5] | During the nine months ended September 30, 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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