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Note 18 - Quarterly Financial Data (Unaudited) - Level 3 | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | 2020 Quarters
(In thousands, except per-share amounts) |  | First |  | Second |  | Third |  | Fourth |  | Year
Net premiums earned |  | $ | 277,415 |  |  | $ | 249,295 |  |  | $ | 286,471 |  |  | $ | 302,140 |  |  | $ | 1,115,321 |
Services revenue |  | 31,927 |  |  | 28,075 |  |  | 33,943 |  |  | 11,440 |  |  | 105,385 |
Net investment income |  | 40,944 |  |  | 38,723 |  |  | 36,255 |  |  | 38,115 |  |  | 154,037 |
Net gains (losses) on investments and other financial instruments |  | (22,027) |  |  | 47,276 |  |  | 17,652 |  |  | 17,376 |  |  | 60,277 |
Provision for losses |  | 35,951 |  |  | 304,418 |  |  | 88,084 |  |  | 56,664 |  |  | 485,117 |
Policy acquisition costs |  | 7,413 |  |  | 6,015 |  |  | 10,166 |  |  | 7,395 |  |  | 30,989 |
Cost of services |  | 22,141 |  |  | 17,972 |  |  | 24,353 |  |  | 21,600 |  |  | 86,066 |
Other operating expenses |  | 69,110 |  |  | 60,582 |  |  | 69,377 |  |  | 81,641 |  |  | 280,710 |
Amortization and impairment of other acquired intangible assets |  | 979 |  |  | 979 |  |  | 961 |  |  | 2,225 |  |  | 5,144 |
Net income (loss) |  | 140,461 |  |  | (29,951) |  |  | 135,103 |  |  | 148,013 |  |  | 393,626 |
Diluted net income (loss) per share (1) |  | $ | 0.70 |  |  | $ | (0.15) |  |  | $ | 0.70 |  |  | $ | 0.76 |  |  | $ | 2.00 |
Weighted-average shares outstanding—diluted |  | 201,819 |  |  | 193,299 |  |  | 194,156 |  |  | 194,663 |  |  | 196,642 |
|  | 2019 Quarters
|  | First |  | Second |  | Third |  | Fourth |  | Year
Net premiums earned |  | $ | 263,512 |  |  | $ | 299,166 |  |  | $ | 281,185 |  |  | $ | 301,486 |  |  | $ | 1,145,349 |
Services revenue |  | 32,753 |  |  | 39,303 |  |  | 42,509 |  |  | 40,031 |  |  | 154,596 |
Net investment income |  | 43,847 |  |  | 43,761 |  |  | 42,756 |  |  | 41,432 |  |  | 171,796 |
Net gains (losses) on investments and other financial instruments |  | 21,913 |  |  | 12,540 |  |  | 13,009 |  |  | 4,257 |  |  | 51,719 |
Provision for losses |  | 20,754 |  |  | 47,427 |  |  | 29,231 |  |  | 34,619 |  |  | 132,031 |
Policy acquisition costs |  | 5,893 |  |  | 6,203 |  |  | 6,435 |  |  | 6,783 |  |  | 25,314 |
Cost of services |  | 24,157 |  |  | 27,845 |  |  | 29,044 |  |  | 27,278 |  |  | 108,324 |
Other operating expenses |  | 78,805 |  |  | 70,046 |  |  | 76,384 |  |  | 80,894 |  |  | 306,129 |
Loss on extinguishment of debt |  | — |  |  | 16,798 |  |  | 5,940 |  |  | — |  |  | 22,738 |
Impairment of goodwill |  | — |  |  | — |  |  | — |  |  | 4,828 |  |  | 4,828 |
Amortization and impairment of other acquired intangible assets |  | 2,187 |  |  | 2,139 |  |  | 2,139 |  |  | 15,823 |  |  | 22,288 |
Net income |  | 170,957 |  |  | 166,730 |  |  | 173,438 |  |  | 161,184 |  |  | 672,309 |
Diluted net income per share (1) |  | $ | 0.78 |  |  | $ | 0.78 |  |  | $ | 0.83 |  |  | $ | 0.79 |  |  | $ | 3.20 |
Weighted-average shares outstanding—diluted |  | 218,343 |  |  | 213,603 |  |  | 208,691 |  |  | 205,165 |  |  | 210,340 |
(1)Diluted net income (loss) 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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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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