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Note 8 - Other Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Deposit with the IRS (Note 9) |  | $ 88,557 |  | $ 88,557
Property and equipment (1) | [1] | 87,332 |  | 87,042
Corporate-owned life insurance |  | 84,622 |  | 85,862
Loaned securities |  | 44,396 |  | 27,964
Accrued investment income |  | 33,542 |  | 31,389
Deferred policy acquisition costs |  | 16,026 |  | 16,987
Reinsurance recoverables |  | 12,587 |  | 8,492
Unbilled Contracts Receivable |  | 20,949 |  | 22,257
Other |  | 38,762 |  | 39,299
Total other assets |  | 426,773 |  | 407,849
Property and Equipment, Owned, Accumulated Depreciation |  | 112,100 |  | 106,000
Depreciation expense |  | 4,700 | $ 4,100 |
Prepaid reinsurance premium |  | 390,241 |  | 386,509
Securities Financing Transaction, Fair Value [Member] |  |  |  |
Loaned securities | [2] | 44,396 |  | 27,964
Mortgage and Real Estate Services Segment [Member] |  |  |  |
Unbilled Contracts Receivable |  | $ 20,949 |  | $ 22,257
[1] | Property and equipment at cost, less accumulated depreciation of $112.1 million and $106.0 million at March 31, 2018 and December 31, 2017, respectively. Depreciation expense was $4.7 million and $4.1 million for the three-month periods ended March 31, 2018 and 2017, respectively.
[2] | Our securities loaned under securities lending agreements are reported at fair value within other assets in our condensed consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.

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