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Note 20 - Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net premiums earned—insurance $ 245,175 $ 236,702 $ 229,096 $ 221,800 $ 233,585 $ 238,149 $ 229,085 $ 220,950 $ 932,773 $ 921,769 $ 915,908
Services revenue 39,703 39,571 37,802 38,027 49,905 45,877 40,263 32,849 155,103 168,894 157,216
Net investment income 33,605 32,540 30,071 31,032 28,996 28,430 28,839 27,201 127,248 113,466 81,537
Net gains on investments and other financial instruments (1,339) 2,480 5,331 (2,851) (38,773) 7,711 30,527 31,286 3,621 30,751 35,693
Provision for losses 35,178 35,841 17,222 46,913 54,287 55,785 49,725 42,991 135,154 202,788 198,585
Policy acquisition costs 5,871 5,554 6,123 6,729 5,579 6,119 5,393 6,389 24,277 23,480 22,424
Cost of services 23,349 27,240 25,635 28,375 33,812 29,447 27,365 23,550 104,599 114,174 93,715
Other operating expenses 65,999 64,195 68,750 68,377 62,416 62,119 63,173 57,188 267,321 244,896 242,405
Restructuring Charges 5,230 12,038 0 0         17,268 0 0
Loss on induced conversion and debt extinguishment 0 45,766 1,247 4,456 0 17,397 2,108 55,570 51,469 75,075 94,207
Goodwill, Impairment Loss 0 0 184,374 0         184,374 0 0
Amortization and impairment of other intangible assets 2,629 2,890 18,856 3,296 3,290 3,292 3,311 3,328 27,671 13,221 12,986
Income (Loss) from Continuing Operations Attributable to Parent                 121,088 308,253 281,539
Income (loss) from discontinued operations, net of tax                 0 0 5,385
Net income $ 6,816 [1] $ 65,142 $ (27,342) $ 76,472 $ 61,089 $ 82,803 $ 98,112 $ 66,249 $ 121,088 $ 308,253 $ 286,924
Net (loss) income per share—diluted $ 0.03 [1],[2] $ 0.30 [2] $ (0.13) [2] $ 0.34 [2] $ 0.27 [2] $ 0.37 [2] $ 0.44 [2] $ 0.29 [2] $ 0.55 [2] $ 1.37 [2] $ 1.22
Weighted-average number of common and common equivalent shares outstanding—diluted 220,250 219,391 215,152 221,497 224,776 225,968 226,203 239,707 220,406 229,258 246,332
[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. For all calculations, the determination of whether potential common shares are dilutive or anti-dilutive is based on net income.