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Note 20 - Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net premiums earned—insurance $ 261,682 $ 258,431 $ 251,344 $ 242,550 $ 245,175 $ 236,702 $ 229,096 $ 221,800 $ 1,014,007 $ 932,773 $ 921,769
Services revenue 38,414 36,566 36,828 33,164 39,703 39,571 37,802 38,027 144,972 155,103 168,894
Net investment income 42,051 38,995 37,473 33,956 33,605 32,540 30,071 31,032 152,475 127,248 113,466
Net Gains (Losses) on Investments and Other Financial Instruments (11,705) (4,480) (7,404) (18,887) (1,339) 2,480 5,331 (2,851) (42,476) 3,621 30,751
Provision for losses 27,140 20,881 19,337 37,283 35,178 35,841 17,222 46,913 104,641 135,154 202,788
Policy acquisition costs 6,485 5,667 5,996 7,117 5,871 5,554 6,123 6,729 25,265 24,277 23,480
Cost of services 24,939 25,854 24,205 23,126 23,349 27,240 25,635 28,375 98,124 104,599 114,174
Other operating expenses 77,266 70,125 70,184 63,243 65,999 64,195 68,750 68,377 280,818 267,321 244,896
Restructuring and other exit costs 113 4,464 925 551 5,230 12,038 0 0 6,053 17,268 0
Loss on induced conversion and debt extinguishment         0 45,766 1,247 4,456 0 51,469 75,075
Impairment of goodwill         0 0 184,374 0 0 184,374 0
Amortization and impairment of other acquired intangible assets 3,461 3,472 2,748 2,748 2,629 2,890 18,856 3,296 12,429 27,671 13,221
Net income $ 139,779 $ 142,797 $ 208,949 $ 114,486 $ 6,816 [1] $ 65,142 $ (27,342) $ 76,472 $ 606,011 $ 121,088 $ 308,253
Diluted net income per share $ 0.64 [2] $ 0.66 [2] $ 0.96 [2] $ 0.52 [2] $ 0.03 [1],[2] $ 0.30 [2] $ (0.13) [2] $ 0.34 [2] $ 2.77 [2] $ 0.55 [2] $ 1.37
Weighted-average number of common and common equivalent shares outstanding—diluted 217,883 217,902 217,830 219,883 220,250 219,391 215,152 221,497 218,553 220,406 229,258
[1] The fourth quarter of 2017 reflects an incremental tax provision related to the remeasurement of our net deferred tax assets as a result of the enactment of the TCJA.
[2] Diluted net income per share is computed independently for each period presented. Consequently, the sum of the quarters may not equal the total net income per share for the year.