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Note 8 - Other Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Deposit with the IRS (Note 9) |  | $ 88,557 |  | $ 88,557 |  | $ 88,557
Property and equipment (1) | [1] | 90,184 |  | 90,184 |  | 87,042
Corporate-owned life insurance |  | 84,560 |  | 84,560 |  | 85,862
Loaned securities |  | 38,350 |  | 38,350 |  | 27,964
Accrued investment income |  | 33,762 |  | 33,762 |  | 31,389
Deferred policy acquisition costs |  | 16,266 |  | 16,266 |  | 16,987
Reinsurance recoverables |  | 12,841 |  | 12,841 |  | 8,492
Unbilled Contracts Receivable |  | 16,478 |  | 16,478 |  | 22,257
Other |  | 49,079 |  | 49,079 |  | 39,299
Total other assets |  | 430,077 |  | 430,077 |  | 407,849
Property and Equipment, Owned, Accumulated Depreciation |  | 115,500 |  | 115,500 |  | 106,000
Depreciation expense |  | 4,800 | $ 4,100 | 9,500 | $ 8,300 |
Prepaid reinsurance premium |  | 405,447 |  | 405,447 |  | 386,509
Securities Financing Transaction, Fair Value [Member] |  |  |  |  |  |
Loaned securities | [2] | $ 38,350 |  | $ 38,350 |  | 27,964
Mortgage and Real Estate Services Segment [Member] |  |  |  |  |  |
Unbilled Contracts Receivable |  |  |  |  |  | $ 22,257
[1] | Property and equipment at cost, less accumulated depreciation of $115.5 million and $106.0 million at June 30, 2018 and December 31, 2017, respectively. Depreciation expense was $4.8 million and $4.1 million for the three-month periods ended June 30, 2018 and 2017, respectively, and $9.5 million and $8.3 million for the six-month periods ended June 30, 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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- Definition Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057816&loc=d3e11446-158418 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column B)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column B)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(7)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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