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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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
Operating Activities                      
Net income $ 127,061 $ 69,875 $ 34,183 $ 15,236 $ 81,859 $ 56,150 $ 72,266 $ 61,348 $ 246,355 $ 271,623 $ 178,939
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Stock-based compensation expense                 16,227 19,077 14,507
Undistributed losses of equity method investments                 (12,408) (12,773) (8,341)
Amortization - other                 59,350 55,205 44,874
Changes in assets and liabilities:                      
Decrease in net federal income taxes                 7,708 7,721 2,428
Increase in other assets                 (27,927) (39,337) (372)
(Decrease) increase in other liabilities                 27,897 34,998 (13,343)
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (1,723,818) (1,856,125) (2,918,203)
Purchase of equity securities                 (230,813) (46,397) (94,344)
Purchase of short-term investments                 (5,762,725) (6,087,909) (4,259,734)
Purchase of other investments                 (79,598) (64,908) (68,578)
Redemption and maturities of fixed income securities, available-for-sale                 1,019,132 626,686 638,916
Sale of fixed income securities, available-for-sale                 487,087 594,743 2,030,664
Sale of equity securities                 1,320 137,294 113,339
Sale of short-term investments                 5,635,463 6,129,885 4,101,530
Financing Activities                      
Dividends to preferred stockholders                 0 0 0
Dividends to common stockholders                 (54,486) (47,675) (42,097)
Acquisition of treasury stock                 (7,053) (8,164) (6,556)
Net proceeds from stock purchase and compensation plans                 8,411 8,243 7,252
Preferred stock issued, net of issuance costs                 195,063 0 0
Cash, beginning of year       300         300    
Cash, end of year 394       300       394 300  
Parent Company [Member]                      
Operating Activities                      
Net income                 246,355 271,623 178,939
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Equity in undistributed income of subsidiaries, net of tax                 (176,146) (205,963) (116,087)
Stock-based compensation expense                 16,227 19,077 14,507
Net realized and unrealized investment (gains) losses                 (1,756) (207) 1,567
Undistributed losses of equity method investments                 672 0 0
Amortization - other                 1,080 4,614 567
Changes in assets and liabilities:                      
Decrease in accrued long-term stock compensation                 (366) (12,970) (15,443)
Decrease in net federal income taxes                 5,549 1,651 11,246
Increase in other assets                 (317) (533) (343)
(Decrease) increase in other liabilities                 (390) 3,919 1,712
Net cash provided by operating activities                 90,908 81,211 76,665
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (89,726) (153,482) (75,046)
Purchase of equity securities                 (157,411) (10,824) 0
Purchase of short-term investments                 (523,961) (1,116,766) (207,115)
Purchase of other investments                 (4,065) 0 0
Redemption and maturities of fixed income securities, available-for-sale                 26,877 10,579 6,849
Sale of fixed income securities, available-for-sale                 23,276 20,189 45,099
Sale of equity securities                 0 10,828 0
Sale of short-term investments                 523,813 1,116,253 195,846
Capital contribution to subsidiaries                 (30,000) 0 0
Net cash used in investing activities                 (231,197) (123,223) (34,367)
Financing Activities                      
Dividends to preferred stockholders                 0 0 0
Dividends to common stockholders                 (54,486) (47,675) (42,097)
Acquisition of treasury stock                 (7,053) (8,164) (6,556)
Proceeds from borrowings                 50,000 290,757 0
Repayment of borrowings                 (50,000) (185,000) 0
Net proceeds from stock purchase and compensation plans                 8,411 8,243 7,252
Preferred stock issued, net of issuance costs                 195,063 0 0
Principal payments of borrowings from subsidiaries                 (1,552) (16,354) (926)
Net cash provided by (used in) financing activities                 140,383 41,807 (42,327)
Net increase (decrease) in cash                 94 (205) (29)
Cash, beginning of year       $ 300       $ 505 300 505 534
Cash, end of year $ 394       $ 300       $ 394 $ 300 $ 505