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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Assets |  |  |
Investments | $ 5,738,734 | $ 5,424,688 |
Cash and cash equivalents | 363,666 | 327,384 |
Accrued investment income | 58,774 | 55,178 |
Total assets | 6,538,380 | 6,213,793 |
Liabilities: |  |  |
Senior notes | 643,196 | 641,724 |
Convertible junior subordinated debentures | 0 | 21,086 |
Other liabilities | 160,009 | 154,966 |
Total liabilities | 1,466,363 | 1,571,053 |
Shareholders’ equity: |  |  |
Common stock | 371,353 | 371,353 |
Paid-in capital | 1,808,113 | 1,798,842 |
Treasury stock, at cost | (1,384,293) | (1,050,238) |
Accumulated other comprehensive income, net of tax | (316,281) | (481,511) |
Retained earnings | 4,593,125 | 4,004,294 |
Total shareholders' equity | 5,072,017 | 4,642,740 | $ 4,861,382
Total liabilities and shareholders' equity | $ 6,538,380 | $ 6,213,793 |
Parenthetical information [Abstract] |  |  |
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) | 272,494,000 | 293,433,000 |
Treasury stock, shares at cost (in shares) | 98,859,000 | 77,920,000 |
Revenues: |  |  |
Investment income, net of expenses | $ 214,740 | $ 167,476 | 156,438
Net gains (losses) on investments and other financial instruments | (14,141) | (7,463) | 5,861
Total revenues | 1,155,102 | 1,172,785 | 1,185,675
Expenses: |  |  |
Interest expense | 36,905 | 48,054 | 71,360
Loss on debt extinguishment | 0 | 40,199 | 36,914
Total losses and expenses | 252,873 | 82,751 | 383,898
Income before tax | 902,229 | 1,090,034 | 801,777
Provision for income taxes | 189,280 | 224,685 | 166,794
Net income | 712,949 | 865,349 | 634,983
Other comprehensive income (loss), net of tax | 165,230 | (601,208) | (97,124)
Comprehensive income | 878,179 | 264,141 | 537,859
Cash flows from operating activities: |  |  |
Net income | 712,949 | 865,349 | 634,983
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred federal | 1,550 | (5,235) | 4,392
Loss on debt extinguishment | 0 | 40,199 | 36,914
Change in certain assets and liabilities: |  |  |
Accrued investment income | (3,596) | (3,276) | (1,905)
Net cash provided by operating activities | 712,962 | 650,012 | 696,317
Cash flows from investing activities: |  |  |
Purchases of investments | (1,469,540) | (674,406) | (1,531,129)
Proceeds from sales of investments | 376,598 | 399,661 | 473,904
Net cash (used in) provided by investing activities | (179,190) | 410,485 | (160,749)
Cash flows from financing activities: |  |  |
Conversion / purchase of convertible junior subordinated debentures | (28,637) | (89,118) | (98,610)
Redemption of 5.75% senior notes | 0 | (242,296) | 0
Cash portion of loss on debt extinguishment | 0 | (39,514) | (36,914)
Repurchase of common stock | (337,182) | (385,573) | (290,818)
Dividends paid | (122,965) | (110,947) | (94,219)
Payment of withholding taxes related to share-based compensation net share settlement | (7,257) | (10,094) | (6,729)
Net cash used in financing activities | (496,041) | (1,032,542) | (527,290)
Net increase in cash and cash equivalents and restricted cash and cash equivalents | 37,731 | 27,955 | 8,278
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year | 332,913 | 304,958 | 296,680
Cash and cash equivalents and restricted cash and cash equivalents at end of year | 370,644 | 332,913 | 304,958
Fixed income |  |  |
Assets |  |  |
Fixed income, available-for-sale | 5,601,540 | 5,342,667 |
Parenthetical information [Abstract] |  |  |
Fixed income, amortized cost | 5,939,483 | 5,859,688 |
Short-Term Investments |  |  |
Assets |  |  |
Fixed income, available-for-sale | 121,573 | 67,031 |
Parenthetical information [Abstract] |  |  |
Fixed income, amortized cost | 121,539 | 67,097 |
Parent Company |  |  |
Assets |  |  |
Investments | 709,333 | 407,509 |
Cash and cash equivalents | 208,600 | 239,404 |
Investment in subsidiaries, at equity in net assets | 4,777,121 | 4,502,261 |
Accounts receivable - affiliates | 2,860 | 864 |
Income taxes - current and deferred | 34,597 | 167,966 |
Accrued investment income | 5,975 | 3,387 |
Total assets | 5,738,486 | 5,321,391 |
Liabilities: |  |  |
Senior notes | 643,196 | 641,724 |
Convertible junior subordinated debentures | 0 | 21,086 |
Accrued interest | 12,797 | 13,271 |
Other liabilities | 10,476 | 2,570 |
Total liabilities | 666,469 | 678,651 |
Shareholders’ equity: |  |  |
Common stock | 371,353 | 371,353 |
Paid-in capital | 1,808,113 | 1,798,842 |
Treasury stock, at cost | (1,384,293) | (1,050,238) |
Accumulated other comprehensive income, net of tax | (316,281) | (481,511) |
Retained earnings | 4,593,125 | 4,004,294 |
Total shareholders' equity | 5,072,017 | 4,642,740 |
Total liabilities and shareholders' equity | $ 5,738,486 | $ 5,321,391 |
Parenthetical information [Abstract] |  |  |
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) | 272,494,000 | 293,433,000 |
Treasury stock, shares at cost (in shares) | 98,859,000 | 77,920,000 |
Revenues: |  |  |
Investment income, net of expenses | $ 30,123 | $ 7,193 | 3,850
Net gains (losses) on investments and other financial instruments | (47) | (2,628) | 490
Total revenues | 30,076 | 4,565 | 4,340
Expenses: |  |  |
Operating expenses | 1,555 | 1,575 | 1,644
Interest expense | 36,905 | 47,601 | 68,359
Loss on debt extinguishment | 0 | 38,870 | 36,914
Total losses and expenses | 38,460 | 88,046 | 106,917
Income before tax | (8,384) | (83,481) | (102,577)
Provision for income taxes | (1,734) | (17,851) | (21,240)
Equity in net income of subsidiaries | 719,599 | 930,979 | 716,320
Net income | 712,949 | 865,349 | 634,983
Other comprehensive income (loss), net of tax | 165,230 | (601,208) | (97,124)
Comprehensive income | 878,179 | 264,141 | 537,859
Cash flows from operating activities: |  |  |
Net income | 712,949 | 865,349 | 634,983
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in net income of subsidiaries | (719,599) | (930,979) | (716,320)
Dividends received from subsidiaries | 326,013 | 626,695 | 400,000
Deferred federal | 86,219 | 119,588 | (21,551)
Loss on debt extinguishment | 0 | 38,870 | 36,914
Other | 26,726 | 33,619 | 29,799
Change in certain assets and liabilities: |  |  |
Accounts receivable - affiliates | (1,996) | 1,266 | (680)
Income taxes receivable | 45,913 | (43,123) | (306)
Accrued investment income | (499) | 931 | 1,118
Accrued interest | 349 | (7,230) | (2,503)
Net cash provided by operating activities | 476,075 | 704,986 | 361,454
Cash flows from investing activities: |  |  |
Purchases of investments | (566,795) | (1,457) | (339,384)
Proceeds from sales of investments | 555,957 | 287,924 | 556,384
Net cash (used in) provided by investing activities | (10,838) | 286,467 | 217,000
Cash flows from financing activities: |  |  |
Conversion / purchase of convertible junior subordinated debentures | (28,637) | (89,118) | (98,610)
Redemption of 5.75% senior notes | 0 | (242,296) | 0
Cash portion of loss on debt extinguishment | 0 | (38,185) | (36,914)
Repurchase of common stock | (337,182) | (385,573) | (290,818)
Dividends paid | (122,965) | (110,947) | (94,219)
Payment of withholding taxes related to share-based compensation net share settlement | (7,257) | (10,094) | (6,729)
Net cash used in financing activities | (496,041) | (876,213) | (527,290)
Net increase in cash and cash equivalents and restricted cash and cash equivalents | (30,804) | 115,240 | 51,164
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year | 239,404 | 124,164 | 73,000
Cash and cash equivalents and restricted cash and cash equivalents at end of year | 208,600 | 239,404 | $ 124,164
Parent Company | Fixed income |  |  |
Assets |  |  |
Fixed income, available-for-sale | 598,420 | 287,332 |
Parenthetical information [Abstract] |  |  |
Fixed income, amortized cost | 597,944 | 299,649 |
Parent Company | Short-Term Investments |  |  |
Assets |  |  |
Fixed income, available-for-sale | 110,913 | 120,177 |
Parenthetical information [Abstract] |  |  |
Fixed income, amortized cost | $ 110,889 | $ 120,102 |

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