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Schedule II - Condensed Financial Information of Registrant (Statements of Cash Flows (Parent Company)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income | $ 1,381,062 | $ 1,022,490 | $ 530,670
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and amortization | 55,872 | 129,682 | 135,065
Stock incentive plans | 49,411 | 46,680 | 49,658
Change in: |  |  |
Other liabilities | 19,878 | 89,467 | 43,039
Net cash from operating activities | 2,568,604 | 2,183,987 | 1,616,686
Cash from (used in) investing activities: |  |  |
Proceeds from sale of fixed maturity securities | 797,948 | 1,842,139 | 3,832,555
Proceeds from maturities and prepayments of fixed maturity securities | 4,891,179 | 6,067,230 | 3,864,327
Cost of purchases of fixed maturity securities | (8,036,680) | (10,716,748) | (7,551,591)
Change in loans receivable | (83,212) | (27,421) | 1,467
Change in balances due from security brokers | 14,337 | (17,983) | (26,515)
Net cash (used in) from investing activities | (1,891,355) | (2,989,146) | 119,696
Cash (used in) from financing activities: |  |  |
Purchase of common treasury shares | (94,140) | (122,426) | (346,357)
Cash dividends to common stockholders | (235,192) | (355,736) | (84,147)
Other, net | (12,848) | (45,162) | (56,225)
Net cash (used in) from financing activities | (771,992) | 5,831 | (397,843)
Net (decrease) increase in cash and cash equivalents | (119,497) | (803,523) | 1,348,656
Cash and cash equivalents at beginning of year | 1,568,843 | 2,372,366 | 1,023,710
Cash and cash equivalents at end of year | 1,449,346 | 1,568,843 | 2,372,366
Parent Company |  |  |
Cash flows from operating activities: |  |  |
Net income | 1,381,062 | 1,022,490 | 530,670
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Net investment gains | (1,007) | (1,474) | (3,580)
Depreciation and amortization | 4,281 | 18,761 | 15,133
Equity in undistributed earnings of subsidiaries | (1,511,478) | (763,367) | (135,535)
Tax payments received from subsidiaries | 321,682 | 328,851 | 165,495
Federal income taxes provided by subsidiaries on a separate return basis | (414,660) | (294,731) | (188,489)
Stock incentive plans | 49,411 | 48,440 | 49,599
Change in: |  |  |
Federal income taxes | (40,746) | (22,017) | 32,069
Other assets | 3,163 | (33,319) | 1,220
Other liabilities | 87,100 | (11,758) | 3,964
Accrued investment income | 890 | 755 | 836
Net cash from operating activities | (120,302) | 292,631 | 471,382
Cash from (used in) investing activities: |  |  |
Proceeds from sale of fixed maturity securities | 543,549 | 402,046 | 414,802
Proceeds from maturities and prepayments of fixed maturity securities | 83,134 | 654,134 | 258,413
Cost of purchases of fixed maturity securities | (109,289) | (1,071,823) | (747,713)
Change in loans receivable | (16,249) | (18,227) | (20,023)
Investments in and advances to subsidiaries, net | (171,062) | (1,411) | (100,704)
Change in balances due from security brokers | (10,289) | 10,487 | (245)
Net additions to real estate, furniture & equipment | (432) | (1,496) | (81)
Other, net | 368 | 95 | 103
Net cash (used in) from investing activities | 319,730 | (26,195) | (195,448)
Cash (used in) from financing activities: |  |  |
Net proceeds from issuance of senior notes | (914) | 1,029,579 | 736,609
Repayment and redemption of debt | (426,503) | (400,000) | (650,000)
Purchase of common treasury shares | (94,140) | (122,426) | (346,357)
Cash dividends to common stockholders | (235,192) | (355,736) | (84,147)
Other, net | (23,194) | (30,776) | (24,880)
Net cash (used in) from financing activities | (779,943) | 120,641 | (368,775)
Net (decrease) increase in cash and cash equivalents | (580,515) | 387,077 | (92,841)
Cash and cash equivalents at beginning of year | 684,037 | 296,960 | 389,801
Cash and cash equivalents at end of year | $ 103,522 | $ 684,037 | $ 296,960

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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