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Parent Corporation Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities                      
Net income $ 45,389 $ 46,996 $ 33,768 $ 39,708 $ 41,350 $ 53,162 $ 29,341 $ 17,974 $ 165,861 $ 141,827 $ 106,418
Adjustments to reconcile net income to net cash provided by operating activities:                      
Stock-based compensation expense                 8,973 8,702 8,630
Loss on disposal of discontinued operations                 0 0 997
Net realized gains                 (13,171) (26,599) (20,732)
Amortization - other                 59,688 45,346 43,461
Changes in assets and liabilities:                      
(Increase) decrease in net federal income taxes                 25,004 31,323 14,834
(Decrease) increase in other assets and other liabilities                 42,699 (33,490) (16,642)
Net adjustments                 215,719 90,936 229,706
Net cash provided by operating activities                 381,580 232,763 336,124
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (1,041,916) (843,616) (1,069,387)
Redemption and maturities of fixed income securities, available-for-sale                 567,445 482,816 513,804
Sale of fixed income securities, available for sale                 106,621 73,415 116,584
Purchase of short-term investments                 (1,602,327) (1,410,123) (2,056,576)
Sale of short-term investments                 1,539,480 1,452,402 2,096,805
Sale of subsidiary                 0 0 1,225
Net cash 9used in) provided by investing activities                 (391,543) (169,468) (391,025)
Financing Activities                      
Dividends to stockholders                 (31,052) (28,428) (27,416)
Acquisition of treasury stock                 (4,182) (3,563) (3,716)
Proceeds from notes payable, net of debt issuance costs                 0 0 178,435
Net proceeds from stock purchase and compensation plans                 10,089 7,283 7,119
Excess tax benefits from share-based payment arrangements                 1,736 1,020 1,545
Repayment of notes payable                 0 0 (100,000)
Net cash (used in) provided by financing activities                 (13,098) (39,529) 54,884
Cash, beginning of year       23,959       193 23,959 193 210
Cash, end of year 898       23,959       898 23,959 193
Parent Company [Member]                      
Operating Activities                      
Net income                 165,861 141,827 106,418
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax                 (141,495) (115,203) (108,899)
Stock-based compensation expense                 8,973 8,702 8,630
Loss on disposal of discontinued operations                 0 0 997
Net realized gains                 0 (2) 0
Amortization - other                 740 1,421 4,353
Changes in assets and liabilities:                      
Increase in accrued long-term stock compensation                 4,575 1,062 6,791
(Increase) decrease in net federal income taxes                 (3,052) 10,977 (14,968)
(Decrease) increase in other assets and other liabilities                 (214) 1,045 1,204
Net adjustments                 (130,473) (91,998) (101,892)
Net cash provided by operating activities                 35,388 49,829 4,526
Investing Activities                      
Purchase of fixed income securities, available-for-sale                 (33,717) (18,511) (21,708)
Redemption and maturities of fixed income securities, available-for-sale                 21,578 23,210 6,432
Sale of fixed income securities, available for sale                 0 300 0
Purchase of short-term investments                 (106,933) (102,717) (241,748)
Sale of short-term investments                 94,422 101,510 253,136
Capital contribution to subsidiaries                 0 0 (57,125)
Sale of subsidiary                 0 0 1,225
Net cash 9used in) provided by investing activities                 (24,650) 3,792 (59,788)
Financing Activities                      
Dividends to stockholders                 (31,052) (28,428) (27,416)
Acquisition of treasury stock                 (4,182) (3,563) (3,716)
Proceeds from notes payable, net of debt issuance costs                 0 0 178,435
Net proceeds from stock purchase and compensation plans                 10,089 7,283 7,119
Excess tax benefits from share-based payment arrangements                 1,736 1,020 1,545
Repayment of notes payable                 0 0 (100,000)
Principal payments of borrowings from subsidiaries                 (2,798) (13,759) (722)
Net cash (used in) provided by financing activities                 (26,207) (37,447) 55,245
Net (decrease) increase in cash                 (15,469) 16,174 (17)
Cash, beginning of year       $ 16,367       $ 193 16,367 193 210
Cash, end of year $ 898       $ 16,367       $ 898 $ 16,367 $ 193