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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.