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Note 8 - Other Assets Components of Other Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Other Assets [Abstract] |  |  |  |  |  |
Deposit with the IRS (Note 9) |  | $ 88,557 |  | $ 88,557 |  | $ 88,557
Corporate-owned life insurance |  | 82,800 |  | 82,800 |  | 85,862
Internal-use software | [1] | 51,191 |  | 51,191 |  | 48,751
Property and equipment | [2] | 38,060 |  | 38,060 |  | 38,291
Accrued investment income |  | 34,430 |  | 34,430 |  | 31,389
Loaned securities |  | 34,364 |  | 34,364 |  | 27,964
Unbilled receivables |  | 19,580 |  | 19,580 |  | 22,257
Deferred policy acquisition costs |  | 16,922 |  | 16,922 |  | 16,987
Reinsurance recoverables |  | 13,542 |  | 13,542 |  | 8,492
Other |  | 35,826 |  | 35,826 |  | 39,299
Total other assets |  | 415,272 |  | 415,272 |  | 407,849
Capitalized Computer Software, Accumulated Amortization |  | 57,200 |  | 57,200 |  | 48,400
Capitalized Computer Software, Amortization |  | 2,900 | $ 2,700 | 8,600 | $ 7,900 |
Property and Equipment, Owned, Accumulated Depreciation |  | 61,000 |  | 61,000 |  | $ 57,600
Depreciation expense |  | $ 2,100 | $ 1,900 | $ 5,900 | $ 4,900 |
[1] | Internal-use software at cost, less accumulated amortization of $57.2 million and $48.4 million at September 30, 2018 and December 31, 2017, respectively. Amortization expense was $2.9 million and $2.7 million for the three-month periods ended September 30, 2018 and 2017, respectively, and $8.6 million and $7.9 million for the nine-month periods ended September 30, 2018 and 2017, respectively.
[2] | Property and equipment at cost, less accumulated depreciation of $61.0 million and $57.6 million at September 30, 2018 and December 31, 2017, respectively. Depreciation expense was $2.1 million and $1.9 million for the three-month periods ended September 30, 2018 and 2017, respectively, and $5.9 million and $4.9 million for the nine-month periods ended September 30, 2018 and 2017, respectively.

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