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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ 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 | $ 1,172,051 | $ 1,157,307 | $ 1,123,607 | $ 1,134,212 | $ 1,214,469 | $ 1,224,075 | $ 1,185,548 | $ 1,167,402 | $ 4,587,178 | $ 4,791,495 | $ 4,148,760
Net investment income | 117,557 | 115,763 | 137,949 | 107,303 | 113,128 | 114,421 | 109,960 | 100,999 | 478,572 | 438,507 | 400,805
Net investment gains | 42,712 | 14,527 | 21,225 | 12,767 | (72,667) | (17,628) | (45,093) | (14,830) | 91,233 | (150,218) | 28,226
Underwriting income (loss) | (49,254) | (78,718) | 78,659 | 77,822 | (194,664) | 59,026 | 115,726 | 143,737 |  |  |
Net income (loss) available (attributable) to common shareholders | $ (9,897) | $ 27,745 | $ 166,387 | $ 98,125 | $ (198,448) | $ 43,439 | $ 92,858 | $ 62,546 | $ 282,361 | $ 396 | $ (415,779)
Earnings (loss) per common share (in dollars per share) | $ (0.12) | $ 0.33 | $ 1.98 | $ 1.17 | $ (2.37) | $ 0.52 | $ 1.11 | $ 0.75 | $ 3.37 | $ 0 | $ (4.94)
Earnings (loss) per diluted common share (in dollars per share) | $ (0.12) | $ 0.33 | $ 1.97 | $ 1.16 | $ (2.37) | $ 0.52 | $ 1.11 | $ 0.75 | $ 3.34 | $ 0 | $ (4.94)
Transaction and reorganization expenses | $ 8,000 | $ 11,000 | $ 3,000 | $ 15,000 | $ 19,000 | $ 16,000 | $ 19,000 | $ 13,000 |  |  |
Amortization of value of business acquired | $ 2,000 | $ 4,000 | $ 7,000 | $ 13,000 | $ 23,000 | $ 39,000 | $ 53,000 | $ 57,000 | $ 26,722 | $ 172,332 | $ 50,104
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 634,831 | 627,389 | 579,428
Corporate |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ 129,096 | $ 108,221 | $ 129,945

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities, the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges. + References No definition available. + Details
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- Definition The net gain or loss (both realized and unrealized) related to investments in certain entities that calculate net asset value per share and the amount after accretion (amortization) of discount (premium) of interest income and dividend income on nonoperating securities, net of investment expense. + References No definition available. + Details
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- Definition Net premiums earned less: net losses and loss expenses, acquisition costs and general and administrative expenses directly related to underwriting activities. + References No definition available. + Details
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- Definition The adjustment that represents the periodic charge against earnings to reduce the value of business acquired (VOBA) over the expected life of the underlying insurance contracts. VOBA reflects the estimated fair value of a life insurance business in force and represents the portion of the cost to acquire the business that is allocated to the value of the right to receive future cash flows from insurance contracts existing at the date of acquisition. Such value is the present value of the actuarially determined projected cash flows for the acquired policies. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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