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.