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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets |  |  |  |  |  |  |  |  |  |  |
Fixed income, available-for-sale, at fair value (amortized cost, 2020 – $773,881; 2019 – $287,489) | $ 6,661,596 |  |  |  | $ 5,737,892 |  |  |  | $ 6,661,596 | $ 5,737,892 |
Cash and cash equivalents | 287,953 |  |  |  | 161,847 |  |  |  | 287,953 | 161,847 |
Accrued investment income | 49,997 |  |  |  | 49,705 |  |  |  | 49,997 | 49,705 |
Other assets | 104,478 |  |  |  | 105,089 |  |  |  | 104,478 | 105,089 |
Total assets | 7,354,526 |  |  |  | 6,229,571 |  |  |  | 7,354,526 | 6,229,571 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Senior notes | 879,379 |  |  |  | 420,867 |  |  |  | 879,379 | 420,867 |
Convertible junior subordinated debentures | 208,814 |  |  |  | 256,872 |  |  |  | 208,814 | 256,872 |
Other liabilities | 244,711 |  |  |  | 151,962 |  |  |  | 244,711 | 151,962 |
Total liabilities | 2,655,540 |  |  |  | 1,920,337 |  |  |  | 2,655,540 | 1,920,337 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2020 - 371,353; 2019 - 371,353; outstanding 2020 - 338,573; 2019 - 347,308) | 371,353 |  |  |  | 371,353 |  |  |  | 371,353 | 371,353 |
Paid-in capital | 1,862,042 |  |  |  | 1,869,719 |  |  |  | 1,862,042 | 1,869,719 |
Treasury stock (shares at cost 2020 – 32,779; 2019 – 24,045) | (393,326) |  |  |  | (283,196) |  |  |  | (393,326) | (283,196) |
Accumulated other comprehensive income, net of tax | 216,821 |  |  |  | 72,708 |  |  |  | 216,821 | 72,708 |
Retained earnings | 2,642,096 |  |  |  | 2,278,650 |  |  |  | 2,642,096 | 2,278,650 |
Total shareholders' equity | 4,698,986 |  |  |  | 4,309,234 |  |  |  | 4,698,986 | 4,309,234 | $ 3,581,891
Total liabilities and shareholders' equity | 7,354,526 |  |  |  | 6,229,571 |  |  |  | 7,354,526 | 6,229,571 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost | $ 6,317,164 |  |  |  | $ 5,562,550 |  |  |  | $ 6,317,164 | $ 5,562,550 |
Common stock, par value (in dollars per share) | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 |
Common stock, shares authorized (in shares) | 1,000,000,000 |  |  |  | 1,000,000,000 |  |  |  | 1,000,000,000 | 1,000,000,000 |
Common stock, shares issued (in shares) | 371,353,000 |  |  |  | 371,353,000 |  |  |  | 371,353,000 | 371,353,000 |
Common stock, shares outstanding (in shares) | 338,573,000 |  |  |  | 347,308,000 |  |  |  | 338,573,000 | 347,308,000 |
Treasury stock, shares at cost (in shares) | 32,779,000 |  |  |  | 24,045,000 |  |  |  | 32,779,000 | 24,045,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses | $ 36,118 | $ 37,252 | $ 39,679 | $ 41,347 | $ 41,322 | $ 42,715 | $ 42,423 | $ 40,585 | $ 154,396 | $ 167,045 | 141,331
Realized gains (losses) | 2,901 | 2,259 | 6,701 | 1,891 | 1,320 | 4,205 | 307 | (526) | 13,752 | 5,306 | (1,353)
Total revenues |  |  |  |  |  |  |  |  | 1,199,146 | 1,213,977 | 1,123,848
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 59,595 | 52,656 | 52,993
Loss on debt extinguishment | 0 | 26,736 | 0 | 0 |  |  |  |  | 26,736 | 0 | 0
Total losses and expenses |  |  |  |  |  |  |  |  | 639,883 | 366,000 | 279,698
Income before tax |  |  |  |  |  |  |  |  | 559,263 | 847,977 | 844,150
Provision for income taxes | 38,782 | 33,518 | 2,436 | 38,434 | 45,599 | 46,186 | 43,433 | 38,996 | 113,170 | 174,214 | 174,053
Net income | 151,430 | 130,811 | 14,047 | 149,805 | 177,110 | 176,934 | 167,778 | 151,941 | 446,093 | 673,763 | 670,097
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 144,113 | 196,922 | (80,413)
Comprehensive income |  |  |  |  |  |  |  |  | 590,206 | 870,685 | 589,684
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | 151,430 | 130,811 | 14,047 | 149,805 | 177,110 | $ 176,934 | $ 167,778 | 151,941 | 446,093 | 673,763 | 670,097
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred Federal |  |  |  |  |  |  |  |  | 28,244 | 11,860 | 185,598
Loss on debt extinguishment | 0 | $ 26,736 | $ 0 | 0 |  |  |  |  | 26,736 | 0 | 0
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Accrued investment income |  |  |  |  |  |  |  |  | (292) | (1,704) | (1,941)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 732,309 | 609,532 | 544,517
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of investments |  |  |  |  |  |  |  |  | (2,636,972) | (1,394,126) | (1,459,473)
Proceeds from sales of investments |  |  |  |  |  |  |  |  | 836,851 | 229,796 | 370,449
Net cash used in investing activities |  |  |  |  |  |  |  |  | (772,506) | (422,108) | (317,780)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior notes |  |  |  |  |  |  |  |  | 640,250 | 0 | 0
Purchase of senior notes |  |  |  |  |  |  |  |  | (179,735) | 0 | 0
Payment of original issue discount - senior notes |  |  |  |  |  |  |  |  | (2,969) | 0 | 0
Purchase of convertible junior subordinated debentures |  |  |  |  |  |  |  |  | (36,392) | 0 | 0
Payment of original issue discount- convertible junior subordinated debentures |  |  |  |  |  |  |  |  | (15,049) | 0 | 0
Cash portion of loss on debt extinguishment |  |  |  |  |  |  |  |  | (25,266) | 0 | 0
Repurchase of common stock |  |  |  |  |  |  |  |  | (119,997) | (125,766) | (163,419)
Dividends paid |  |  |  |  |  |  |  |  | (82,061) | (41,914) | 0
Payment of debt issuance costs |  |  |  |  |  |  |  |  | (2,020) | 0 | 0
Payment of withholding taxes related to share-based compensation net share settlement |  |  |  |  |  |  |  |  | (8,940) | (5,726) | (8,131)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 167,821 | (173,406) | (171,550)
Net increase in cash and cash equivalents and restricted cash and cash equivalents |  |  |  |  |  |  |  |  | 127,624 | 14,018 | 55,187
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year |  |  |  | 169,056 |  |  |  | 155,038 | 169,056 | 155,038 | 99,851
Cash and cash equivalents and restricted cash and cash equivalents at end of year | 296,680 |  |  |  | 169,056 |  |  |  | 296,680 | 169,056 | 155,038
Parent Company |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Fixed income, available-for-sale, at fair value (amortized cost, 2020 – $773,881; 2019 – $287,489) | 773,995 |  |  |  | 288,362 |  |  |  | 773,995 | 288,362 |
Cash and cash equivalents | 73,000 |  |  |  | 36,621 |  |  |  | 73,000 | 36,621 |
Investment in subsidiaries, at equity in net assets | 4,740,074 |  |  |  | 4,611,356 |  |  |  | 4,740,074 | 4,611,356 |
Accounts receivable - affiliates | 1,450 |  |  |  | 2,129 |  |  |  | 1,450 | 2,129 |
Income taxes -current and deferred | 219,059 |  |  |  | 196,978 |  |  |  | 219,059 | 196,978 |
Accrued investment income | 3,760 |  |  |  | 2,498 |  |  |  | 3,760 | 2,498 |
Other assets | 0 |  |  |  | 81 |  |  |  | 0 | 81 |
Total assets | 5,811,338 |  |  |  | 5,138,025 |  |  |  | 5,811,338 | 5,138,025 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Senior notes | 879,379 |  |  |  | 420,867 |  |  |  | 879,379 | 420,867 |
Convertible junior subordinated debentures | 208,814 |  |  |  | 389,522 |  |  |  | 208,814 | 389,522 |
Accrued interest | 23,004 |  |  |  | 17,928 |  |  |  | 23,004 | 17,928 |
Other liabilities | 1,155 |  |  |  | 474 |  |  |  | 1,155 | 474 |
Total liabilities | 1,112,352 |  |  |  | 828,791 |  |  |  | 1,112,352 | 828,791 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2020 - 371,353; 2019 - 371,353; outstanding 2020 - 338,573; 2019 - 347,308) | 371,353 |  |  |  | 371,353 |  |  |  | 371,353 | 371,353 |
Paid-in capital | 1,862,042 |  |  |  | 1,869,719 |  |  |  | 1,862,042 | 1,869,719 |
Treasury stock (shares at cost 2020 – 32,779; 2019 – 24,045) | (393,326) |  |  |  | (283,196) |  |  |  | (393,326) | (283,196) |
Accumulated other comprehensive income, net of tax | 216,821 |  |  |  | 72,708 |  |  |  | 216,821 | 72,708 |
Retained earnings | 2,642,096 |  |  |  | 2,278,650 |  |  |  | 2,642,096 | 2,278,650 |
Total shareholders' equity | 4,698,986 |  |  |  | 4,309,234 |  |  |  | 4,698,986 | 4,309,234 |
Total liabilities and shareholders' equity | 5,811,338 |  |  |  | 5,138,025 |  |  |  | 5,811,338 | 5,138,025 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost | $ 773,881 |  |  |  | $ 287,489 |  |  |  | $ 773,881 | $ 287,489 |
Common stock, par value (in dollars per share) | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 |
Common stock, shares authorized (in shares) | 1,000,000,000 |  |  |  | 1,000,000,000 |  |  |  | 1,000,000,000 | 1,000,000,000 |
Common stock, shares issued (in shares) | 371,353,000 |  |  |  | 371,353,000 |  |  |  | 371,353,000 | 371,353,000 |
Common stock, shares outstanding (in shares) | 338,573,000 |  |  |  | 347,308,000 |  |  |  | 338,573,000 | 347,308,000 |
Treasury stock, shares at cost (in shares) | 32,779,000 |  |  |  | 24,045,000 |  |  |  | 32,779,000 | 24,045,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses |  |  |  |  |  |  |  |  | $ 7,090 | $ 7,695 | 4,685
Realized gains (losses) |  |  |  |  |  |  |  |  | 1,454 | (311) | (532)
Total revenues |  |  |  |  |  |  |  |  | 8,544 | 7,384 | 4,153
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 719 | 793 | 637
Interest expense |  |  |  |  |  |  |  |  | 65,472 | 61,593 | 61,930
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 35,033 | 0 | 0
Total losses and expenses |  |  |  |  |  |  |  |  | 101,224 | 62,386 | 62,567
Income before tax |  |  |  |  |  |  |  |  | (92,680) | (55,002) | (58,414)
Provision for income taxes |  |  |  |  |  |  |  |  | (18,431) | (12,263) | (13,517)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 520,342 | 716,502 | 714,994
Net income |  |  |  |  |  |  |  |  | 446,093 | 673,763 | 670,097
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 144,113 | 196,922 | (80,413)
Comprehensive income |  |  |  |  |  |  |  |  | 590,206 | 870,685 | 589,684
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 446,093 | 673,763 | 670,097
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (520,342) | (716,502) | (714,994)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 221,024 | 154,413 | 199,692
Deferred Federal |  |  |  |  |  |  |  |  | (18,252) | (10,416) | (11,756)
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 35,033 | 0 | 0
Other |  |  |  |  |  |  |  |  | 19,088 | 21,104 | 24,303
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - affiliates |  |  |  |  |  |  |  |  | 972 | (735) | 18
Income taxes receivable |  |  |  |  |  |  |  |  | 0 | 1 | 17,859
Accrued investment income |  |  |  |  |  |  |  |  | (1,262) | (478) | 112
Accrued interest |  |  |  |  |  |  |  |  | 5,076 | (2) | (4)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 187,430 | 121,148 | 185,327
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of investments |  |  |  |  |  |  |  |  | (1,131,060) | (117,663) | (83,003)
Proceeds from sales of investments |  |  |  |  |  |  |  |  | 812,188 | 160,040 | 93,481
Net cash used in investing activities |  |  |  |  |  |  |  |  | (318,872) | 42,377 | 10,478
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior notes |  |  |  |  |  |  |  |  | 640,250 | 0 | 0
Purchase of senior notes |  |  |  |  |  |  |  |  | (179,735) | 0 | 0
Payment of original issue discount - senior notes |  |  |  |  |  |  |  |  | (2,969) | 0 | 0
Purchase of convertible junior subordinated debentures |  |  |  |  |  |  |  |  | (36,392) | 0 | 0
Payment of original issue discount- convertible junior subordinated debentures |  |  |  |  |  |  |  |  | (15,049) | 0 | 0
Cash portion of loss on debt extinguishment |  |  |  |  |  |  |  |  | (25,266) | 0 | 0
Repurchase of common stock |  |  |  |  |  |  |  |  | (119,997) | (125,766) | (163,419)
Dividends paid |  |  |  |  |  |  |  |  | (82,061) | (41,914) | 0
Payment of debt issuance costs |  |  |  |  |  |  |  |  | (2,020) | 0 | 0
Payment of withholding taxes related to share-based compensation net share settlement |  |  |  |  |  |  |  |  | (8,940) | (5,726) | (8,131)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 167,821 | (173,406) | (171,550)
Net increase in cash and cash equivalents and restricted cash and cash equivalents |  |  |  |  |  |  |  |  | 36,379 | (9,881) | 24,255
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year |  |  |  | $ 36,621 |  |  |  | $ 46,502 | 36,621 | 46,502 | 22,247
Cash and cash equivalents and restricted cash and cash equivalents at end of year | $ 73,000 |  |  |  | $ 36,621 |  |  |  | $ 73,000 | $ 36,621 | $ 46,502

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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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