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Note 8 - Other Assets Components of Other Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Company-owned life insurance |  | $ 85,729 |  |  | $ 83,377
Right-of-use assets | [2] | 47,150 | [1] |  | 0
Internal-use software | [3] | 46,611 |  |  | 51,367
Property and equipment | [4] | 39,530 |  |  | 37,090
Accrued investment income |  | 33,275 |  |  | 34,878
Unbilled receivables |  | 22,967 |  |  | 19,917
Loaned securities (Note 5) |  | 22,606 |  |  | 27,860
Deferred policy acquisition costs |  | 17,594 |  |  | 17,311
Reinsurance recoverables |  | 15,401 |  |  | 14,402
Current federal income tax receivable | [5] | 0 |  |  | 44,506
Other |  | 42,815 |  |  | 36,992
Total other assets |  | 373,678 |  |  | 367,700
Accumulated Amortization, Right-of-Use Assets |  | 2,300 |  |  |
Capitalized Computer Software, Accumulated Amortization |  | 63,700 |  |  | 60,300
Capitalized Computer Software, Impairments |  | 3,800 |  |  | 5,100
Capitalized Computer Software, Amortization |  | 3,100 |  | $ 2,800 |
Property and Equipment, Owned, Accumulated Depreciation |  | 64,500 |  |  | 62,900
Depreciation expense |  | $ 2,100 |  | $ 1,900 |
REMIC Residual | Internal Revenue Service (IRS) |  |  |  |  |
Refund of Qualified Deposit Assets from U.S. Department of Treasury |  |  |  |  | $ 57,200
[1] | Classified in other assets in our condensed consolidated balance sheets. See Note 8.
[2] | 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 $2.3 million at March 31, 2019.
[3] | Internal-use software, at cost, has been reduced by accumulated amortization of $63.7 million and $60.3 million at March 31, 2019 and December 31, 2018, respectively, as well as $3.8 million of impairment charges in the three months ended March 31, 2019, and $5.1 million of impairment charges in 2018. Amortization expense was $3.1 million and $2.8 million for the three-month periods ended March 31, 2019 and 2018, respectively.
[4] | Property and equipment at cost, less accumulated depreciation of $64.5 million and $62.9 million at March 31, 2019 and December 31, 2018, respectively. Depreciation expense was $2.1 million and $1.9 million for the three-month periods ended March 31, 2019 and 2018, respectively.
[5] | During the three months ended March 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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