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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (TABLES) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
UNAUDITED SUMMARY OF QUARTERLY FINANCIAL RESULTS | The following is an unaudited summary of our quarterly financial results:
| Quarters ended | Mar 31 |  | Jun 30 |  | Sep 30 |  | Dec 31 |
| 2016 |  |  |  |  |  |  |  |
| Net premiums earned | $ | 902,340 |  |  | $ | 946,990 |  |  | $ | 934,415 |  |  | $ | 921,879 |  |
| Net investment income | 49,164 |  |  | 91,730 |  |  | 116,923 |  |  | 95,517 |  |
| Net realized investment gains (losses) | (66,508 | ) |  | 21,010 |  |  | 5,205 |  |  | (20,229 | ) |
| Underwriting income | 98,951 |  |  | 9,860 |  |  | 103,998 |  |  | 66,265 |  |
| Net income available to common shareholders | 38,417 |  |  | 119,491 |  |  | 176,644 |  |  | 130,912 |  |
| Earnings per common share - basic | $ | 0.41 |  |  | $ | 1.30 |  |  | $ | 1.97 |  |  | $ | 1.50 |  |
| Earnings per common share - diluted | $ | 0.41 |  |  | $ | 1.29 |  |  | $ | 1.96 |  |  | $ | 1.48 |  |
| 2015 |  |  |  |  |  |  |  |
| Net premiums earned | $ | 904,053 |  |  | $ | 941,211 |  |  | $ | 919,341 |  |  | $ | 921,812 |  |
| Net investment income | 92,107 |  |  | 88,544 |  |  | 45,685 |  |  | 79,000 |  |
| Net realized investment losses | (42,553 | ) |  | (11,110 | ) |  | (69,957 | ) |  | (14,872 | ) |
| Underwriting income | 100,790 |  |  | 56,848 |  |  | 56,245 |  |  | 88,358 |  |
| Net income available to common shareholders | 155,803 |  |  | 63,349 |  |  | 247,620 |  |  | 134,787 |  |
| Earnings per common share - basic | $ | 1.56 |  |  | $ | 0.63 |  |  | $ | 2.52 |  |  | $ | 1.40 |  |
| Earnings per common share - diluted | $ | 1.54 |  |  | $ | 0.63 |  |  | $ | 2.50 |  |  | $ | 1.39 |  |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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