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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets |  |  |  |  |  |  |  |  |  |  |
Fixed income, available-for-sale, at fair value (amortized cost, 2019 – $287,489; 2018 – $203,743) | $ 5,737,892 |  |  |  | $ 5,151,987 |  |  |  | $ 5,737,892 | $ 5,151,987 |
Cash and cash equivalents | 161,847 |  |  |  | 151,892 |  |  |  | 161,847 | 151,892 |
Accrued investment income | 49,705 |  |  |  | 48,001 |  |  |  | 49,705 | 48,001 |
Other assets | 99,347 |  |  |  | 85,572 |  |  |  | 99,347 | 85,572 |
Total assets | 6,229,571 |  |  |  | 5,677,802 |  |  |  | 6,229,571 | 5,677,802 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Senior notes | 420,867 |  |  |  | 419,713 |  |  |  | 420,867 | 419,713 |
Convertible junior subordinated debentures | 256,872 |  |  |  | 256,872 |  |  |  | 256,872 | 256,872 |
Other liabilities | 151,962 |  |  |  | 180,322 |  |  |  | 151,962 | 180,322 |
Total liabilities | 1,920,337 |  |  |  | 2,095,911 |  |  |  | 1,920,337 | 2,095,911 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2019 - 371,353; 2018 - 371,353; outstanding 2019 - 347,308; 2018 - 355,371) | 371,353 |  |  |  | 371,353 |  |  |  | 371,353 | 371,353 |
Paid-in capital | 1,869,719 |  |  |  | 1,862,536 |  |  |  | 1,869,719 | 1,862,536 |
Treasury stock (shares at cost 2019 – 24,045; 2018 – 15,982) | (283,196) |  |  |  | (175,059) |  |  |  | (283,196) | (175,059) |
Accumulated other comprehensive income (loss), net of tax | 72,708 |  |  |  | (124,214) |  |  |  | 72,708 | (124,214) |
Retained earnings | 2,278,650 |  |  |  | 1,647,275 |  |  |  | 2,278,650 | 1,647,275 |
Total shareholders' equity | 4,309,234 |  |  |  | 3,581,891 |  |  |  | 4,309,234 | 3,581,891 | $ 3,154,526
Total liabilities and shareholders' equity | 6,229,571 |  |  |  | 5,677,802 |  |  |  | 6,229,571 | 5,677,802 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost | $ 5,562,550 |  |  |  | $ 5,196,784 |  |  |  | $ 5,562,550 | $ 5,196,784 |
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) | 347,308,000 |  |  |  | 355,371,000 |  |  |  | 347,308,000 | 355,371,000 |
Treasury stock, shares at cost (in shares) | 24,045,000 |  |  |  | 15,982,000 |  |  |  | 24,045,000 | 15,982,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses | $ 41,322 | $ 42,715 | $ 42,423 | $ 40,585 | $ 38,328 | $ 36,380 | $ 34,502 | $ 32,121 | $ 167,045 | $ 141,331 | 120,871
Realized (losses) gains | 1,320 | 4,205 | 307 | (526) | (241) | 1,114 | (1,897) | (329) | 5,306 | (1,353) | 231
Total revenues |  |  |  |  |  |  |  |  | 1,213,977 | 1,123,848 | 1,066,054
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 52,656 | 52,993 | 57,035
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 | 65
Total losses and expenses |  |  |  |  |  |  |  |  | 366,000 | 279,698 | 281,558
Income before tax |  |  |  |  |  |  |  |  | 847,977 | 844,150 | 784,496
Provision for income taxes | 45,599 | 46,186 | 43,433 | 38,996 | 36,963 | 49,994 | 50,708 | 36,388 | 174,214 | 174,053 | 428,735
Net income | 177,110 | 176,934 | 167,778 | 151,941 | 157,746 | 181,900 | 186,814 | 143,637 | 673,763 | 670,097 | 355,761
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 196,922 | (80,413) | 41,739
Comprehensive income |  |  |  |  |  |  |  |  | 870,685 | 589,684 | 397,500
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | 177,110 | $ 176,934 | $ 167,778 | 151,941 | 157,746 | $ 181,900 | $ 186,814 | 143,637 | 673,763 | 670,097 | 355,761
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Deferred Federal |  |  |  |  |  |  |  |  | 11,860 | 185,598 | 351,677
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 | 65
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Accrued investment income |  |  |  |  |  |  |  |  | (1,704) | (1,941) | (1,987)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 609,532 | 544,517 | 406,657
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (422,108) | (317,780) | (303,641)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  |  | 0 | 0 | 150,000
Repayment of revolving credit facility |  |  |  |  |  |  |  |  | 0 | 0 | (150,000)
Purchase or repayment of convertible senior notes |  |  |  |  |  |  |  |  | 0 | 0 | (145,620)
Repurchase of common stock |  |  |  |  |  |  |  |  | (125,766) | (163,419) | 0
Dividends paid |  |  |  |  |  |  |  |  | (41,914) | 0 | 0
Payment of debt issuance costs |  |  |  |  |  |  |  |  | 0 | 0 | (1,630)
Payment of withholding taxes related to share-based compensation net share settlement |  |  |  |  |  |  |  |  | (5,726) | (8,131) | (6,821)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (173,406) | (171,550) | (158,575)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents |  |  |  |  |  |  |  |  | 14,018 | 55,187 | (55,559)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year |  |  |  | 155,038 |  |  |  | 99,851 | 155,038 | 99,851 | 155,410
Cash and cash equivalents and restricted cash and cash equivalents at end of year | 169,056 |  |  |  | 155,038 |  |  |  | 169,056 | 155,038 | 99,851
Parent Company |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Fixed income, available-for-sale, at fair value (amortized cost, 2019 – $287,489; 2018 – $203,743) | 288,362 |  |  |  | 201,507 |  |  |  | 288,362 | 201,507 |
Cash and cash equivalents | 36,621 |  |  |  | 46,502 |  |  |  | 36,621 | 46,502 |
Investment in subsidiaries, at equity in net assets | 4,611,356 |  |  |  | 3,981,970 |  |  |  | 4,611,356 | 3,981,970 |
Accounts receivable - affiliates | 2,129 |  |  |  | 1,396 |  |  |  | 2,129 | 1,396 |
Income taxes - current and deferred | 196,978 |  |  |  | 186,561 |  |  |  | 196,978 | 186,561 |
Accrued investment income | 2,498 |  |  |  | 2,020 |  |  |  | 2,498 | 2,020 |
Other assets | 81 |  |  |  | 740 |  |  |  | 81 | 740 |
Total assets | 5,138,025 |  |  |  | 4,420,696 |  |  |  | 5,138,025 | 4,420,696 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Senior notes | 420,867 |  |  |  | 419,713 |  |  |  | 420,867 | 419,713 |
Convertible junior subordinated debentures | 389,522 |  |  |  | 389,522 |  |  |  | 389,522 | 389,522 |
Accrued interest | 17,928 |  |  |  | 17,930 |  |  |  | 17,928 | 17,930 |
Other liabilities | 474 |  |  |  | 11,640 |  |  |  | 474 | 11,640 |
Total liabilities | 828,791 |  |  |  | 838,805 |  |  |  | 828,791 | 838,805 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2019 - 371,353; 2018 - 371,353; outstanding 2019 - 347,308; 2018 - 355,371) | 371,353 |  |  |  | 371,353 |  |  |  | 371,353 | 371,353 |
Paid-in capital | 1,869,719 |  |  |  | 1,862,536 |  |  |  | 1,869,719 | 1,862,536 |
Treasury stock (shares at cost 2019 – 24,045; 2018 – 15,982) | (283,196) |  |  |  | (175,059) |  |  |  | (283,196) | (175,059) |
Accumulated other comprehensive income (loss), net of tax | 72,708 |  |  |  | (124,214) |  |  |  | 72,708 | (124,214) |
Retained earnings | 2,278,650 |  |  |  | 1,647,275 |  |  |  | 2,278,650 | 1,647,275 |
Total shareholders' equity | 4,309,234 |  |  |  | 3,581,891 |  |  |  | 4,309,234 | 3,581,891 |
Total liabilities and shareholders' equity | 5,138,025 |  |  |  | 4,420,696 |  |  |  | 5,138,025 | 4,420,696 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost | $ 287,489 |  |  |  | $ 203,743 |  |  |  | $ 287,489 | $ 203,743 |
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) | 347,308,000 |  |  |  | 355,371,000 |  |  |  | 347,308,000 | 355,371,000 |
Treasury stock, shares at cost (in shares) | 24,045,000 |  |  |  | 15,982,000 |  |  |  | 24,045,000 | 15,982,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses |  |  |  |  |  |  |  |  | $ 7,695 | $ 4,685 | 3,177
Realized (losses) gains |  |  |  |  |  |  |  |  | (311) | (532) | (13)
Total revenues |  |  |  |  |  |  |  |  | 7,384 | 4,153 | 3,164
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 793 | 637 | 642
Interest expense |  |  |  |  |  |  |  |  | 61,593 | 61,930 | 65,972
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 | 65
Total losses and expenses |  |  |  |  |  |  |  |  | 62,386 | 62,567 | 66,679
Income before tax |  |  |  |  |  |  |  |  | (55,002) | (58,414) | (63,515)
Provision for income taxes |  |  |  |  |  |  |  |  | (12,263) | (13,517) | 95,517
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 716,502 | 714,994 | 514,793
Net income |  |  |  |  |  |  |  |  | 673,763 | 670,097 | 355,761
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 196,922 | (80,413) | 41,739
Comprehensive income |  |  |  |  |  |  |  |  | 870,685 | 589,684 | 397,500
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 673,763 | 670,097 | 355,761
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (716,502) | (714,994) | (514,793)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 154,413 | 199,692 | 110,145
Deferred Federal |  |  |  |  |  |  |  |  | (10,416) | (11,756) | 96,741
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | 0 | 65
Other |  |  |  |  |  |  |  |  | 21,104 | 24,303 | 18,716
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - affiliates |  |  |  |  |  |  |  |  | (735) | 18 | (634)
Income taxes receivable |  |  |  |  |  |  |  |  | 1 | 17,859 | 297
Accrued investment income |  |  |  |  |  |  |  |  | (478) | 112 | (192)
Accrued interest |  |  |  |  |  |  |  |  | (2) | (4) | (2,819)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 121,148 | 185,327 | 63,287
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of investments |  |  |  |  |  |  |  |  | (117,663) | (83,003) | (97,091)
Proceeds from sales of investments |  |  |  |  |  |  |  |  | 160,040 | 93,481 | 176,960
Net cash used in investing activities |  |  |  |  |  |  |  |  | 42,377 | 10,478 | 79,869
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  |  | 0 | 0 | 150,000
Repayment of revolving credit facility |  |  |  |  |  |  |  |  | 0 | 0 | (150,000)
Purchase or repayment of convertible senior notes |  |  |  |  |  |  |  |  | 0 | 0 | (150,124)
Repurchase of common stock |  |  |  |  |  |  |  |  | (125,766) | (163,419) | 0
Dividends paid |  |  |  |  |  |  |  |  | (41,914) | 0 | 0
Payment of debt issuance costs |  |  |  |  |  |  |  |  | 0 | 0 | (1,630)
Payment of withholding taxes related to share-based compensation net share settlement |  |  |  |  |  |  |  |  | (5,726) | (8,131) | (6,821)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (173,406) | (171,550) | (158,575)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents |  |  |  |  |  |  |  |  | (9,881) | 24,255 | (15,419)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year |  |  |  | $ 46,502 |  |  |  | $ 22,247 | 46,502 | 22,247 | 37,666
Cash and cash equivalents and restricted cash and cash equivalents at end of year | $ 36,621 |  |  |  | $ 46,502 |  |  |  | $ 36,621 | $ 46,502 | $ 22,247

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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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