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Parent Corporation Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 30,242 | $ 46,718 | $ 41,426 | $ 50,440 | $ 39,360 | $ 38,502 | $ 43,601 | $ 37,032 | $ 168,826 | $ 158,495 | $ 165,861
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 12,089 | 10,449 | 8,973
Net realized losses |  |  |  |  |  |  |  |  | (6,359) | 4,937 | (13,171)
Amortization - other |  |  |  |  |  |  |  |  | 52,100 | 61,671 | 59,688
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Decrease (increase) in net federal income taxes |  |  |  |  |  |  |  |  | 30,918 | 11,150 | 25,004
Decrease in other assets |  |  |  |  |  |  |  |  | 9,872 | 30,071 | 11,523
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 27,297 | 9,191 | 77,564
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 370,733 | 301,783 | 381,580
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | (2,130,362) | (1,982,023) | (1,041,916)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 555,216 | 641,524 | 567,445
Sale of fixed income securities, available for sale |  |  |  |  |  |  |  |  | 58,832 | 102,868 | 106,621
Purchase of short-term investments |  |  |  |  |  |  |  |  | (4,280,553) | (3,499,380) | (1,602,327)
Sale of short-term investments |  |  |  |  |  |  |  |  | 4,338,318 | 3,470,022 | 1,539,480
Net cash used in investing activities |  |  |  |  |  |  |  |  | (331,075) | (318,101) | (391,543)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (37,045) | (33,758) | (31,052)
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (6,015) | (4,992) | (4,182)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  | 7,599 | 7,811 | 10,089
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | 0 | 1,819 | 1,736
Net cash used in financing activities |  |  |  |  |  |  |  |  | (39,582) | 15,878 | (13,098)
Cash, beginning of year |  |  |  | 458 |  |  |  | 898 | 458 | 898 | 23,959
Cash, end of year | 534 |  |  |  | 458 |  |  |  | 534 | 458 | 898
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 168,826 | 158,495 | 165,861
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax |  |  |  |  |  |  |  |  | (131,797) | (135,425) | (141,495)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 12,089 | 10,449 | 8,973
Net realized losses |  |  |  |  |  |  |  |  | 15 | 220 | 0
Amortization - other |  |  |  |  |  |  |  |  | 678 | 648 | 740
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Increase in accrued long-term stock compensation |  |  |  |  |  |  |  |  | 4,988 | 5,564 | 4,575
Decrease (increase) in net federal income taxes |  |  |  |  |  |  |  |  | 3,811 | (3,612) | (3,052)
Decrease in other assets |  |  |  |  |  |  |  |  | (60) | (202) | (12)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 714 | 80 | (202)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 59,264 | 36,217 | 35,388
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | (58,832) | (45,789) | (33,717)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 10,465 | 14,983 | 21,578
Sale of fixed income securities, available for sale |  |  |  |  |  |  |  |  | 31,819 | 18,768 | 0
Purchase of short-term investments |  |  |  |  |  |  |  |  | (185,590) | (119,501) | (106,933)
Sale of short-term investments |  |  |  |  |  |  |  |  | 179,292 | 130,841 | 94,422
Net cash used in investing activities |  |  |  |  |  |  |  |  | (22,846) | (698) | (24,650)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (37,045) | (33,758) | (31,052)
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (6,015) | (4,992) | (4,182)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  | 7,599 | 7,811 | 10,089
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | 0 | 1,819 | 1,736
Principal payments of borrowings from subsidiaries |  |  |  |  |  |  |  |  | (881) | (6,839) | (2,798)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (36,342) | (35,959) | (26,207)
Net increase (decrease) in cash |  |  |  |  |  |  |  |  | 76 | (440) | (15,469)
Cash, beginning of year |  |  |  | $ 458 |  |  |  | $ 898 | 458 | 898 | 16,367
Cash, end of year | $ 534 |  |  |  | $ 458 |  |  |  | $ 534 | $ 458 | $ 898

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