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OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of AOCI into net income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other realized investment gains (losses) |  |  |  |  |  |  |  |  | $ 42,719 | $ (34,315) | $ (65,771)
OTTI losses |  |  |  |  |  |  |  |  | (14,493) | (26,210) | (72,720)
Income (loss) before income taxes and interest in income (loss) of equity method investments |  |  |  |  |  |  |  |  | (368,109) | 521,802 | 644,659
Foreign exchange losses |  |  |  |  |  |  |  |  | (134,737) | 121,295 | 102,312
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 7,542 | (6,340) | (3,028)
Net income (loss) available to common shareholders | $ (38,081) | $ (467,740) | $ 85,030 | $ 5,014 | $ 130,912 | $ 176,644 | $ 119,491 | $ 38,417 | (415,779) | 465,462 | 601,562
Non-cash foreign exchange losses |  |  |  |  |  |  |  |  | 24,149 | 0 | 0
Unrealized gains (losses) on available for sale investments | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other realized investment gains (losses) |  |  |  |  |  |  |  |  | 48,385 | (34,213) | (73,046)
OTTI losses |  |  |  |  |  |  |  |  | (14,493) | (26,210) | (72,720)
Income (loss) before income taxes and interest in income (loss) of equity method investments |  |  |  |  |  |  |  |  | 33,892 | (60,423) | (145,766)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (758) | (1,767) | 775
Net income (loss) available to common shareholders |  |  |  |  |  |  |  |  | 33,134 | (62,190) | (144,991)
Cumulative foreign currency translation adjustments, net of tax | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification out of accumulated comprehensive income into net income available to common shareholders [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign exchange losses |  |  |  |  |  |  |  |  | (24,149) | 0 | 0
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) available to common shareholders |  |  |  |  |  |  |  |  | $ (24,149) | $ 0 | $ 0

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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 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 Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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