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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA | An unaudited summary of quarterly financial results is shown in the following table:
| Quarters ended | Mar 31 |  | Jun 30 |  | Sep 30 |  | Dec 31 |
| 2017 |  |  |  |  |  |  |  |
| Net premiums earned | $ | 938,703 |  |  | $ | 981,431 |  |  | $ | 1,017,131 |  |  | $ | 1,211,495 |  |
| Net investment income | 98,664 |  |  | 106,063 |  |  | 95,169 |  |  | 100,908 |  |
| Net realized investment gains (losses) | (25,050 | ) |  | (4,392 | ) |  | 14,632 |  |  | 43,038 |  |
| Underwriting income (loss) | 16,385 |  |  | 57,012 |  |  | (512,853 | ) |  | 26,130 |  |
| Net income (loss) available to common shareholders | 5,014 |  |  | 85,030 |  |  | (467,740 | ) |  | (38,081 | ) |
| Earnings (loss) per common share - basic | $ | 0.06 |  |  | $ | 1.01 |  |  | $ | (5.61 | ) |  | $ | (0.46 | ) |
| Earnings (loss) per common share - diluted | $ | 0.06 |  |  | $ | 1.01 |  |  | $ | (5.61 | ) |  | $ | (0.46 | ) |
| 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 |  |
(1) | During the three months ended September 30, and December 31, 2017, the Company recognized transaction and reorganization expenses of $6 million and $21 million, respectively, related to the acquisition and integration of Novae. Refer to Item 8, Note 18 of the Consolidated Financial Statements 'Transaction and Reorganization Expenses' for further details.
(2) | During the three months ended December 31, 2017, the Company recognized a tax expense of $42 million due to the revaluation of net deferred tax assets pursuant to the U.S. Tax Reform. Refer to Item 8, Note 19 of the Consolidated Financial Statements 'Income Taxes' for further details.
(3) | During the three months ended December 31, 2017, the Company recognized amortization of value of business acquired of $50 million related to the acquisition of Novae. Refer to Item 8, Note 3 and Note 5 of the Consolidated Financial Statements 'Business Combinations' and 'Goodwill and Intangible Assets' for further details.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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