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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Assets |  |  |
Fixed income, available-for-sale | $ 5,409,698 | $ 6,587,581 |
Cash and cash equivalents | 327,384 | 284,690 |
Accrued investment income | 55,178 | 51,902 |
Total assets | 6,213,793 | 7,325,008 |
Liabilities: |  |  |
Senior notes | 641,724 | 881,508 |
Convertible junior subordinated debentures | 21,086 | 110,204 |
Other liabilities | 154,966 | 191,702 |
Total liabilities | 1,571,053 | 2,463,626 |
Shareholders’ equity: |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2022 - 371,353; 2021 - 371,353; shares outstanding 2022 - 293,433; 2021 - 320,336) | 371,353 | 371,353 |
Paid-in capital | 1,798,842 | 1,794,906 |
Treasury stock at cost (shares 2022 - 77,920; 2021 - 51,017) | (1,050,238) | (675,265) |
Accumulated other comprehensive income, net of tax | (481,511) | 119,697 |
Retained earnings | 4,004,294 | 3,250,691 |
Total shareholders' equity | 4,642,740 | 4,861,382 | $ 4,698,986
Total liabilities and shareholders' equity | 6,213,793 | 7,325,008 |
Parenthetical information [Abstract] |  |  |
Fixed income, amortized cost | $ 5,926,785 | $ 6,397,658 |
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) | 371,353,000 | 371,353,000 |
Common stock, shares outstanding (in shares) | 293,433,000 | 320,336,000 |
Treasury stock, shares at cost (in shares) | 77,920,000 | 51,017,000 |
Revenues: |  |  |
Investment income, net of expenses | $ 167,476 | $ 156,438 | 154,396
Net gains (losses) on investments and other financial instruments | (7,463) | 5,861 | 12,576
Total revenues | 1,172,785 | 1,185,675 | 1,199,146
Expenses: |  |  |
Interest expense | 48,054 | 71,360 | 59,595
Loss on debt extinguishment | 40,199 | 36,914 | 26,736
Total losses and expenses | 82,751 | 383,898 | 639,883
Income before tax | 1,090,034 | 801,777 | 559,263
Provision for income taxes | 224,685 | 166,794 | 113,170
Net income | 865,349 | 634,983 | 446,093
Other comprehensive income (loss), net of tax | (601,208) | (97,124) | 144,113
Comprehensive income | 264,141 | 537,859 | 590,206
Cash flows from operating activities: |  |  |
Net income | 865,349 | 634,983 | 446,093
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred federal | (5,235) | 4,392 | 28,244
Loss on debt extinguishment | 40,199 | 36,914 | 26,736
Change in certain assets and liabilities: |  |  |
Accrued investment income | (3,276) | (1,905) | (292)
Net cash provided by operating activities | 650,012 | 696,317 | 732,309
Cash flows from investing activities: |  |  |
Purchases of investments | (674,406) | (1,531,129) | (2,636,972)
Proceeds from sales of investments | 399,661 | 473,904 | 836,851
Net cash provided by (used in) investing activities | 410,485 | (160,749) | (772,506)
Cash flows from financing activities: |  |  |
Proceeds from issuance of senior notes | 0 | 0 | 640,250
Payment of original issue discount - senior notes | 0 | 0 | (2,969)
Purchase of convertible junior subordinated debentures | (89,118) | (98,610) | (36,392)
Payment of original issue discount- convertible junior subordinated debentures | 0 | 0 | (15,049)
Redemption of 5.75% senior notes | (242,296) | 0 | 0
Cash portion of loss on debt extinguishment | (39,514) | (36,914) | (25,266)
Repurchase of common stock | (385,573) | (290,818) | (119,997)
Dividends paid | (110,947) | (94,219) | (82,061)
Payment of debt issuance costs | 0 | 0 | (2,020)
Payment of withholding taxes related to share-based compensation net share settlement | (10,094) | (6,729) | (8,940)
Net cash (used in) provided by financing activities | (1,032,542) | (527,290) | 167,821
Net increase in cash and cash equivalents and restricted cash and cash equivalents | 27,955 | 8,278 | 127,624
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year | 304,958 | 296,680 | 169,056
Cash and cash equivalents and restricted cash and cash equivalents at end of year | 332,913 | 304,958 | 296,680
Parent Company |  |  |
Assets |  |  |
Fixed income, available-for-sale | 407,509 | 538,872 |
Cash and cash equivalents | 239,404 | 124,164 |
Investment in subsidiaries, at equity in net assets | 4,502,261 | 4,964,954 |
Accounts receivable - affiliates | 864 | 2,130 |
Income taxes - current and deferred | 167,966 | 242,427 |
Accrued investment income | 3,387 | 2,642 |
Total assets | 5,321,391 | 5,875,189 |
Liabilities: |  |  |
Senior notes | 641,724 | 881,508 |
Convertible junior subordinated debentures | 21,086 | 110,204 |
Accrued interest | 13,271 | 20,501 |
Other liabilities | 2,570 | 1,594 |
Total liabilities | 678,651 | 1,013,807 |
Shareholders’ equity: |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2022 - 371,353; 2021 - 371,353; shares outstanding 2022 - 293,433; 2021 - 320,336) | 371,353 | 371,353 |
Paid-in capital | 1,798,842 | 1,794,906 |
Treasury stock at cost (shares 2022 - 77,920; 2021 - 51,017) | (1,050,238) | (675,265) |
Accumulated other comprehensive income, net of tax | (481,511) | 119,697 |
Retained earnings | 4,004,294 | 3,250,691 |
Total shareholders' equity | 4,642,740 | 4,861,382 |
Total liabilities and shareholders' equity | 5,321,391 | 5,875,189 |
Parenthetical information [Abstract] |  |  |
Fixed income, amortized cost | $ 419,751 | $ 550,324 |
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) | 371,353,000 | 371,353,000 |
Common stock, shares outstanding (in shares) | 293,433,000 | 32,336,000 |
Treasury stock, shares at cost (in shares) | 77,920,000 | 51,017,000 |
Revenues: |  |  |
Investment income, net of expenses | $ 7,193 | $ 3,850 | 7,090
Net gains (losses) on investments and other financial instruments | (2,628) | 490 | 1,454
Total revenues | 4,565 | 4,340 | 8,544
Expenses: |  |  |
Operating expenses | 1,575 | 1,644 | 719
Interest expense | 47,601 | 68,359 | 65,472
Loss on debt extinguishment | 38,870 | 36,914 | 35,033
Total losses and expenses | 88,046 | 106,917 | 101,224
Income before tax | (83,481) | (102,577) | (92,680)
Provision for income taxes | (17,851) | (21,240) | (18,431)
Equity in net income of subsidiaries | 930,979 | 716,320 | 520,342
Net income | 865,349 | 634,983 | 446,093
Other comprehensive income (loss), net of tax | (601,208) | (97,124) | 144,113
Comprehensive income | 264,141 | 537,859 | 590,206
Cash flows from operating activities: |  |  |
Net income | 865,349 | 634,983 | 446,093
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in net income of subsidiaries | (930,979) | (716,320) | (520,342)
Dividends received from subsidiaries | 626,695 | 400,000 | 221,024
Deferred federal | 119,588 | (21,551) | (18,252)
Loss on debt extinguishment | 38,870 | 36,914 | 35,033
Other | 33,619 | 29,799 | 19,088
Change in certain assets and liabilities: |  |  |
Accounts receivable - affiliates | 1,266 | (680) | 972
Income taxes receivable | (43,123) | (306) | 0
Accrued investment income | 931 | 1,118 | (1,262)
Accrued interest | (7,230) | (2,503) | 5,076
Net cash provided by operating activities | 704,986 | 361,454 | 187,430
Cash flows from investing activities: |  |  |
Purchases of investments | (1,457) | (339,384) | (1,131,060)
Proceeds from sales of investments | 287,924 | 556,384 | 812,188
Net cash provided by (used in) investing activities | 286,467 | 217,000 | (318,872)
Cash flows from financing activities: |  |  |
Proceeds from issuance of senior notes | 0 | 0 | 640,250
Purchase of senior notes | 0 | 0 | (179,735)
Payment of original issue discount - senior notes | 0 | 0 | (2,969)
Purchase of convertible junior subordinated debentures | (89,118) | (98,610) | (36,392)
Payment of original issue discount- convertible junior subordinated debentures | 0 | 0 | (15,049)
Redemption of 5.75% senior notes | (242,296) | 0 | 0
Cash portion of loss on debt extinguishment | (38,185) | (36,914) | (25,266)
Repurchase of common stock | (385,573) | (290,818) | (119,997)
Dividends paid | (110,947) | (94,219) | (82,061)
Payment of debt issuance costs | 0 | 0 | (2,020)
Payment of withholding taxes related to share-based compensation net share settlement | (10,094) | (6,729) | (8,940)
Net cash (used in) provided by financing activities | (876,213) | (527,290) | 167,821
Net increase in cash and cash equivalents and restricted cash and cash equivalents | 115,240 | 51,164 | 36,379
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year | 124,164 | 73,000 | 36,621
Cash and cash equivalents and restricted cash and cash equivalents at end of year | $ 239,404 | $ 124,164 | $ 73,000

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