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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets                      
Fixed income, available-for-sale, at fair value (amortized cost, 2018 – $203,743; 2017 – $195,846) $ 5,151,987       $ 4,983,315       $ 5,151,987 $ 4,983,315  
Cash and cash equivalents 151,892       99,851       151,892 99,851  
Accrued investment income 48,001       46,060       48,001 46,060  
Other assets 85,572       78,478       85,572 78,478  
Total assets 5,677,802       5,619,499       5,677,802 5,619,499  
Liabilities:                      
Senior notes 419,713       418,560       419,713 418,560  
Convertible junior subordinated debentures 256,872       256,872       256,872 256,872  
Other liabilities 180,322       255,972       180,322 255,972  
Total liabilities 2,095,911       2,464,973       2,095,911 2,464,973  
Shareholders’ equity:                      
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2018 - 371,353; 2017 - 370,567; outstanding 2018 - 355,371; 2017 - 370,567) 371,353       370,567       371,353 370,567  
Paid-in capital 1,862,536       1,850,582       1,862,536 1,850,582  
Treasury stock (shares at cost 2018 – 15,982) (175,059)       0       (175,059) 0  
Accumulated other comprehensive loss, net of tax (124,214)       (43,783)       (124,214) (43,783)  
Retained earnings 1,647,275       977,160       1,647,275 977,160  
Total shareholders' equity 3,581,891       3,154,526       3,581,891 3,154,526 $ 2,548,842
Total liabilities and shareholders' equity 5,677,802       5,619,499       5,677,802 5,619,499  
Parenthetical information [Abstract]                      
Fixed income, amortized cost $ 5,196,784       $ 4,946,278       $ 5,196,784 $ 4,946,278  
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       370,567,000       371,353,000 370,567,000  
Common stock, shares outstanding (in shares) 355,371,000       370,567,000       355,371,000 370,567,000  
Treasury stock, shares at cost (in shares) 15,982,000       0       15,982,000 0  
Revenues:                      
Investment income, net of expenses $ 38,328 $ 36,380 $ 34,502 $ 32,121 $ 31,276 $ 30,402 $ 29,716 $ 29,477 $ 141,331 $ 120,871 110,666
Realized (losses) gains (241) 1,114 (1,897) (329) 458 (50) (52) (125) (1,353) 231 8,921
Total revenues                 1,123,848 1,066,054 1,062,483
Expenses:                      
Interest expense                 52,993 57,035 56,672
Loss on debt extinguishment         0 0 65 0 0 65 90,531
Total losses and expenses                 279,698 281,558 547,769
Income before tax                 844,150 784,496 514,714
Provision for income taxes 36,963 49,994 50,708 36,388 218,142 64,440 61,994 84,159 174,053 428,735 172,197
Net income 157,746 181,900 186,814 143,637 27,314 120,027 118,622 89,798 670,097 355,761 342,517
Other comprehensive (loss) income, net of tax                 (80,413) 41,739 (14,220)
Comprehensive income                 589,684 397,500 328,297
Cash flows from operating activities:                      
Net income 157,746 $ 181,900 $ 186,814 143,637 27,314 120,027 118,622 89,798 670,097 355,761 342,517
Adjustments to reconcile net income to net cash provided by operating activities:                      
Deferred Federal                 185,598 351,677 160,657
Loss on debt extinguishment         0 $ 0 $ 65 0 0 65 90,531
Change in certain assets and liabilities:                      
Accrued investment income                 (1,941) (1,987) (3,849)
Net cash provided by operating activities                 544,517 406,657 224,760
Cash flows from investing activities:                      
Net cash used in investing activities                 (317,780) (303,641) (93,392)
Cash flows from financing activities:                      
Proceeds from revolving credit facility                 0 150,000 0
Repayment of revolving credit facility                 0 (150,000) 0
Proceeds from issuance of long-term debt                 0 0 573,094
Purchase or repayment of convertible senior notes                 0 (145,620) (363,778)
Repurchase of common stock                 (163,419) 0 (147,127)
Payment of debt issuance costs                 0 (1,630) (1,127)
Payment of withholding taxes related to share-based compensation net share settlement                 (8,131) (6,821) (5,030)
Net cash used in financing activities                 (171,550) (158,575) (157,078)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents                 55,187 (55,559) (25,710)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year       99,851       155,410 99,851 155,410 181,120
Cash and cash equivalents and restricted cash and cash equivalents at end of year 155,038       99,851       155,038 99,851 155,410
Parent Company                      
Assets                      
Fixed income, available-for-sale, at fair value (amortized cost, 2018 – $203,743; 2017 – $195,846) 201,507       194,061       201,507 194,061  
Cash and cash equivalents 46,502       22,247       46,502 22,247  
Investment in subsidiaries, at equity in net assets 3,981,970       3,567,034       3,981,970 3,567,034  
Accounts receivable - affiliates 1,396       1,414       1,396 1,414  
Income taxes - current and deferred 186,561       192,570       186,561 192,570  
Accrued investment income 2,020       1,941       2,020 1,941  
Other assets 740       1,275       740 1,275  
Total assets 4,420,696       3,980,542       4,420,696 3,980,542  
Liabilities:                      
Senior notes 419,713       418,560       419,713 418,560  
Convertible junior subordinated debentures 389,522       389,522       389,522 389,522  
Accrued interest 17,930       17,934       17,930 17,934  
Other liabilities 11,640       0       11,640 0  
Total liabilities 838,805       826,016       838,805 826,016  
Shareholders’ equity:                      
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2018 - 371,353; 2017 - 370,567; outstanding 2018 - 355,371; 2017 - 370,567) 371,353       370,567       371,353 370,567  
Paid-in capital 1,862,536       1,850,582       1,862,536 1,850,582  
Treasury stock (shares at cost 2018 – 15,982) (175,059)       0       (175,059) 0  
Accumulated other comprehensive loss, net of tax (124,214)       (43,783)       (124,214) (43,783)  
Retained earnings 1,647,275       977,160       1,647,275 977,160  
Total shareholders' equity 3,581,891       3,154,526       3,581,891 3,154,526  
Total liabilities and shareholders' equity 4,420,696       3,980,542       4,420,696 3,980,542  
Parenthetical information [Abstract]                      
Fixed income, amortized cost $ 203,743       $ 195,846       $ 203,743 $ 195,846  
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       370,567,000       371,353,000 370,567,000  
Common stock, shares outstanding (in shares) 355,371,000       370,567,000       355,371,000 370,567,000  
Treasury stock, shares at cost (in shares) 15,982,000       0       15,982,000 0  
Revenues:                      
Investment income, net of expenses                 $ 4,685 $ 3,177 3,807
Realized (losses) gains                 (532) (13) 646
Total revenues                 4,153 3,164 4,453
Expenses:                      
Operating expenses                 637 642 1,409
Interest expense                 61,930 65,972 64,598
Loss on debt extinguishment                 0 65 82,234
Total losses and expenses                 62,567 66,679 148,241
Income before tax                 (58,414) (63,515) (143,788)
Provision for income taxes                 (13,517) 95,517 (52,575)
Equity in net income of subsidiaries                 714,994 514,793 433,730
Net income                 670,097 355,761 342,517
Other comprehensive (loss) income, net of tax                 (80,413) 41,739 (14,220)
Comprehensive income                 589,684 397,500 328,297
Cash flows from operating activities:                      
Net income                 670,097 355,761 342,517
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in net income of subsidiaries                 (714,994) (514,793) (433,730)
Dividends received from subsidiaries                 199,692 110,145 64,000
Deferred Federal                 (11,756) 96,741 (55,988)
Loss on debt extinguishment                 0 65 82,234
Other                 24,303 18,716 16,722
Change in certain assets and liabilities:                      
Accounts receivable - affiliates                 18 (634) 158
Income taxes receivable                 17,859 297 3,602
Accrued investment income                 112 (192) 1,951
Accrued interest                 (4) (2,819) 6,811
Net cash provided by operating activities                 185,327 63,287 28,277
Cash flows from investing activities:                      
Capital distributions from subsidiaries                 0 0 51,987
Capital contributions to subsidiaries                 0 0 (36,025)
Purchases of investments                 (83,003) (97,091) (194,751)
Proceeds from sales of investments                 93,481 176,960 330,142
Net cash used in investing activities                 10,478 79,869 151,353
Cash flows from financing activities:                      
Proceeds from revolving credit facility                 0 150,000 0
Repayment of revolving credit facility                 0 (150,000) 0
Proceeds from issuance of long-term debt                 0 0 418,094
Purchase or repayment of convertible senior notes                 0 (150,124) (426,191)
Repurchase of common stock                 (163,419) 0 (147,127)
Payment of debt issuance costs                 0 (1,630) (1,127)
Payment of withholding taxes related to share-based compensation net share settlement                 (8,131) (6,821) (5,030)
Net cash used in financing activities                 (171,550) (158,575) (161,381)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents                 24,255 (15,419) 18,249
Cash and cash equivalents and restricted cash and cash equivalents at beginning of year       $ 22,247       $ 37,666 22,247 37,666 19,417
Cash and cash equivalents and restricted cash and cash equivalents at end of year $ 46,502       $ 22,247       $ 46,502 $ 22,247 $ 37,666