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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details) - USD ($) $ / shares in Units, $ 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 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income (amortized cost, 2017 – $195,846; 2016 – $247,396) |  |  |  |  |  |  |  |  |  |  |  | $ 4,983,315 | $ 4,685,222 |
Cash and cash equivalents | $ 99,851 |  |  | $ 155,410 | $ 155,410 |  |  | $ 181,120 | $ 155,410 | $ 181,120 | $ 197,882 | 99,851 | 155,410 | $ 181,120
Accrued investment income |  |  |  |  |  |  |  |  |  |  |  | 46,060 | 44,073 |
Other assets |  |  |  |  |  |  |  |  |  |  |  | 78,478 | 73,345 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 5,619,499 | 5,734,529 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  | 418,560 | 417,406 |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | 0 | 349,461 |
Convertible junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |  | 256,872 | 256,872 |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 2,464,973 | 3,185,687 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2017 - 370,567; 2016 - 359,400; outstanding 2017 - 370,567; 2016 - 340,663) |  |  |  |  |  |  |  |  |  |  |  | 370,567 | 359,400 |
Paid-in capital |  |  |  |  |  |  |  |  |  |  |  | 1,850,582 | 1,782,337 |
Treasury stock (shares at cost 2016 – 18,737) |  |  |  |  |  |  |  |  |  |  |  | 0 | (150,359) |
Accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  | (43,783) | (75,100) |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 977,160 | 632,564 |
Total shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 3,154,526 | 2,548,842 | 2,236,140
Total liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 5,619,499 | 5,734,529 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost |  |  |  |  |  |  |  |  |  |  |  | $ 4,946,278 | $ 4,717,211 |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 1 |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 370,567,000 | 359,400,000 |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 370,567,000 | 340,663,000 |
Treasury stock, shares at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 18,737,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses | 31,276 | $ 30,402 | $ 29,716 | 29,477 | 28,094 | $ 27,515 | $ 27,248 | 27,809 | 120,871 | 110,666 | 103,741 |  |  |
Realized gains (losses) | 460 | (47) | (42) | (122) | (52) | 5,092 | 836 | 3,056 | 249 | 8,932 | 28,361 |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,066,054 | 1,062,483 | 1,041,288 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 57,035 | 56,672 | 68,932 |  |  |
Loss on debt extinguishment | 0 | 0 | 65 | 0 | 0 | 75,223 | 1,868 | 13,440 | 65 | 90,531 | 507 |  |  |
Total losses and expenses |  |  |  |  |  |  |  |  | 281,558 | 547,769 | 553,601 |  |  |
Income before tax |  |  |  |  |  |  |  |  | 784,496 | 514,714 | 487,687 |  |  |
Provision for (benefit from) income taxes | 218,142 | 64,440 | 61,994 | 84,159 | 54,551 | 27,131 | 56,018 | 34,497 | 428,735 | 172,197 | (684,313) |  |  |
Net income | 27,314 | 120,027 | 118,622 | 89,798 | 107,487 | 56,618 | 109,221 | 69,191 | 355,761 | 342,517 | 1,172,000 |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 41,739 | (14,220) | 20,461 |  |  |
Comprehensive income |  |  |  |  |  |  |  |  | 397,500 | 328,297 | 1,192,461 |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 27,314 | 120,027 | 118,622 | 89,798 | 107,487 | 56,618 | 109,221 | 69,191 | 355,761 | 342,517 | 1,172,000 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Federal |  |  |  |  |  |  |  |  | 351,677 | 160,657 | (686,652) |  |  |
Loss on debt extinguishment | 0 | $ 0 | $ 65 | 0 | 0 | $ 75,223 | $ 1,868 | 13,440 | 65 | 90,531 | 507 |  |  |
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued investment income |  |  |  |  |  |  |  |  | (1,987) | (3,849) | (9,706) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 406,657 | 224,760 | 161,395 |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income |  |  |  |  |  |  |  |  | (1,293,616) | (1,360,386) | (2,462,844) |  |  |
Sale of fixed income |  |  |  |  |  |  |  |  | 246,908 | 728,042 | 1,796,153 |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (303,641) | (93,392) | (96,958) |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  |  | 150,000 | 0 | 0 |  |  |
Repayment of revolving credit facility |  |  |  |  |  |  |  |  | (150,000) | 0 | 0 |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 573,094 | 0 |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | (61,953) |  |  |
Purchase or repayment of convertible senior notes |  |  |  |  |  |  |  |  | (145,620) | (363,778) | (11,152) |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 0 | (147,127) | 0 |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  |  | (1,630) | (1,127) | 0 |  |  |
Payment of withholding taxes related to share-based compensation net share settlement |  |  |  |  |  |  |  |  | (6,821) | (5,030) | (7,242) |  |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (158,575) | (157,078) | (81,199) |  |  |
Net decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | (55,559) | (25,710) | (16,762) |  |  |
Cash and cash equivalents at beginning of year |  |  |  | 155,410 |  |  |  | 181,120 | 155,410 | 181,120 | 197,882 |  |  |
Cash and cash equivalents at end of year | 99,851 |  |  |  | 155,410 |  |  |  | 99,851 | 155,410 | 181,120 |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income (amortized cost, 2017 – $195,846; 2016 – $247,396) |  |  |  |  |  |  |  |  |  |  |  | $ 194,061 | $ 245,435 |
Cash and cash equivalents | 22,247 |  |  | 37,666 | 37,666 |  |  | 19,417 | 37,666 | 19,417 | 10,507 | 22,247 | 37,666 | $ 19,417
Investment in subsidiaries, at equity in net assets |  |  |  |  |  |  |  |  |  |  |  | 3,567,034 | 3,150,671 |
Accounts receivable - affiliates |  |  |  |  |  |  |  |  |  |  |  | 1,414 | 780 |
Income taxes - current and deferred |  |  |  |  |  |  |  |  |  |  |  | 192,570 | 289,703 |
Accrued investment income |  |  |  |  |  |  |  |  |  |  |  | 1,941 | 1,749 |
Other assets |  |  |  |  |  |  |  |  |  |  |  | 1,275 | 80 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 3,980,542 | 3,726,084 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  | 418,560 | 417,406 |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | 0 | 349,461 |
Convertible junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |  | 389,522 | 389,522 |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  | 17,934 | 20,853 |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 826,016 | 1,177,242 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2017 - 370,567; 2016 - 359,400; outstanding 2017 - 370,567; 2016 - 340,663) |  |  |  |  |  |  |  |  |  |  |  | 370,567 | 359,400 |
Paid-in capital |  |  |  |  |  |  |  |  |  |  |  | 1,850,582 | 1,782,337 |
Treasury stock (shares at cost 2016 – 18,737) |  |  |  |  |  |  |  |  |  |  |  | 0 | (150,359) |
Accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  | (43,783) | (75,100) |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 977,160 | 632,564 |
Total shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 3,154,526 | 2,548,842 |
Total liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 3,980,542 | 3,726,084 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost |  |  |  |  |  |  |  |  |  |  |  | $ 195,846 | $ 247,396 |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 1 |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 370,567,000 | 359,400,000 |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 370,567,000 | 340,663,000 |
Treasury stock, shares at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 18,737,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses |  |  |  |  |  |  |  |  | 3,177 | 3,807 | 7,586 |  |  |
Realized gains (losses) |  |  |  |  |  |  |  |  | (13) | 646 | 357 |  |  |
Total revenues |  |  |  |  |  |  |  |  | 3,164 | 4,453 | 7,943 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 642 | 1,409 | 582 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 65,972 | 64,598 | 68,932 |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 65 | 82,234 | 507 |  |  |
Total losses and expenses |  |  |  |  |  |  |  |  | 66,679 | 148,241 | 70,021 |  |  |
Income before tax |  |  |  |  |  |  |  |  | (63,515) | (143,788) | (62,078) |  |  |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 95,517 | (52,575) | (125,487) |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 514,793 | 433,730 | 1,108,591 |  |  |
Net income |  |  |  |  |  |  |  |  | 355,761 | 342,517 | 1,172,000 |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 41,739 | (14,220) | 20,461 |  |  |
Comprehensive income |  |  |  |  |  |  |  |  | 397,500 | 328,297 | 1,192,461 |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 355,761 | 342,517 | 1,172,000 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (514,793) | (433,730) | (1,108,591) |  |  |
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 110,145 | 64,000 | 6,500 |  |  |
Deferred Federal |  |  |  |  |  |  |  |  | 96,741 | (55,988) | (125,532) |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 65 | 82,234 | 507 |  |  |
Other |  |  |  |  |  |  |  |  | 18,716 | 16,722 | 31,701 |  |  |
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - affiliates |  |  |  |  |  |  |  |  | (634) | 158 | (626) |  |  |
Income taxes receivable |  |  |  |  |  |  |  |  | 297 | 3,602 | (8,308) |  |  |
Accrued investment income |  |  |  |  |  |  |  |  | (192) | 1,951 | (265) |  |  |
Accrued interest |  |  |  |  |  |  |  |  | (2,819) | 6,811 | (652) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 63,287 | 28,277 | (33,266) |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital distributions from subsidiaries |  |  |  |  |  |  |  |  | 0 | 51,987 | 32,000 |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  | 0 | (36,025) | 0 |  |  |
Purchase of fixed income |  |  |  |  |  |  |  |  | (97,091) | (194,751) | (295,010) |  |  |
Sale of fixed income |  |  |  |  |  |  |  |  | 176,960 | 330,142 | 386,385 |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | 79,869 | 151,353 | 123,375 |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  |  | 150,000 | 0 | 0 |  |  |
Repayment of revolving credit facility |  |  |  |  |  |  |  |  | (150,000) | 0 | 0 |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 418,094 | 0 |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | (61,953) |  |  |
Purchase or repayment of convertible senior notes |  |  |  |  |  |  |  |  | (150,124) | (426,191) | (12,004) |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 0 | (147,127) | 0 |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  |  | (1,630) | (1,127) | 0 |  |  |
Payment of withholding taxes related to share-based compensation net share settlement |  |  |  |  |  |  |  |  | (6,821) | (5,030) | (7,242) |  |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (158,575) | (161,381) | (81,199) |  |  |
Net decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | (15,419) | 18,249 | 8,910 |  |  |
Cash and cash equivalents at beginning of year |  |  |  | $ 37,666 |  |  |  | $ 19,417 | 37,666 | 19,417 | 10,507 |  |  |
Cash and cash equivalents at end of year | $ 22,247 |  |  |  | $ 37,666 |  |  |  | $ 22,247 | $ 37,666 | $ 19,417 |  |  |

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- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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