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Note 19 - Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned—insurance (Note 8) | $ 301,486 |  | $ 281,185 |  | $ 299,166 |  | $ 263,512 |  | $ 261,682 |  | $ 258,431 |  | $ 251,344 |  | $ 242,550 |  | $ 1,145,349 |  | $ 1,014,007 |  | $ 932,773
Services revenue (Note 4) | 40,031 |  | 42,509 |  | 39,303 |  | 32,753 |  | 38,414 |  | 36,566 |  | 36,828 |  | 33,164 |  | 154,596 |  | 144,972 |  | 155,103
Net investment income (Note 6) | 41,432 |  | 42,756 |  | 43,761 |  | 43,847 |  | 42,051 |  | 38,995 |  | 37,473 |  | 33,956 |  | 171,796 |  | 152,475 |  | 127,248
Net gains (losses) on investments and other financial instruments | 4,257 |  | 13,009 |  | 12,540 |  | 21,913 |  | (11,705) |  | (4,480) |  | (7,404) |  | (18,887) |  | 51,719 |  | (42,476) |  | 3,621
Provision for losses | 34,619 |  | 29,231 |  | 47,427 |  | 20,754 |  | 27,140 |  | 20,881 |  | 19,337 |  | 37,283 |  | 132,031 |  | 104,641 |  | 135,154
Policy acquisition costs | 6,783 |  | 6,435 |  | 6,203 |  | 5,893 |  | 6,485 |  | 5,667 |  | 5,996 |  | 7,117 |  | 25,314 |  | 25,265 |  | 24,277
Cost of services | 27,278 |  | 29,044 |  | 27,845 |  | 24,157 |  | 24,939 |  | 25,854 |  | 24,205 |  | 23,126 |  | 108,324 |  | 98,124 |  | 104,599
Other operating expenses | 80,894 |  | 76,384 |  | 70,046 |  | 78,805 |  | 77,266 |  | 70,125 |  | 70,184 |  | 63,243 |  | 306,129 |  | 280,818 |  | 267,321
Restructuring and other exit costs |  |  |  |  |  |  |  |  | 113 |  | 4,464 |  | 925 |  | 551 |  | 0 |  | 6,053 |  | 17,268
Loss on extinguishment of debt | 0 |  | 5,940 |  | 16,798 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill | 4,828 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  | 4,828 |  | 0 |  | 184,374
Amortization and impairment of other acquired intangible assets | 15,823 |  | 2,139 |  | 2,139 |  | 2,187 |  | 3,461 |  | 3,472 |  | 2,748 |  | 2,748 |  | 22,288 |  | 12,429 |  | 27,671
Net income | $ 161,184 |  | $ 173,438 |  | $ 166,730 |  | $ 170,957 |  | $ 139,779 |  | $ 142,797 |  | $ 208,949 |  | $ 114,486 |  | $ 672,309 |  | $ 606,011 |  | $ 121,088
Diluted net income per share | $ 0.79 | [1] | $ 0.83 | [1] | $ 0.78 | [1] | $ 0.78 | [1] | $ 0.64 | [1] | $ 0.66 | [1] | $ 0.96 | [1] | $ 0.52 | [1] | $ 3.20 | [1] | $ 2.77 | [1] | $ 0.55
Weighted-average number of common and common equivalent shares outstanding—diluted | 205,165 |  | 208,691 |  | 213,603 |  | 218,343 |  | 217,883 |  | 217,902 |  | 217,830 |  | 219,883 |  | 210,340 |  | 218,553 |  | 220,406
[1] | 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.

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