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Parent Corporation Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 39,360 | $ 38,502 | $ 43,601 | $ 37,032 | $ 45,389 | $ 46,996 | $ 33,768 | $ 39,708 | $ 158,495 | $ 165,861 | $ 141,827
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 10,449 | 8,973 | 8,702
Net realized losses (gains) |  |  |  |  |  |  |  |  | 4,937 | (13,171) | (26,599)
Amortization - other |  |  |  |  |  |  |  |  | 61,671 | 59,688 | 45,346
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
(Increase) decrease in net federal income taxes |  |  |  |  |  |  |  |  | 11,150 | 25,004 | 31,323
(Decrease) increase in other assets |  |  |  |  |  |  |  |  | 30,071 | 11,523 | (1,186)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 9,191 | 77,564 | (35,632)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 301,783 | 381,580 | 232,763
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | (1,982,023) | (1,041,916) | (843,616)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 641,524 | 567,445 | 482,816
Sale of fixed income securities, available for sale |  |  |  |  |  |  |  |  | 102,868 | 106,621 | 73,415
Purchase of short-term investments |  |  |  |  |  |  |  |  | (3,499,380) | (1,602,327) | (1,410,123)
Sale of short-term investments |  |  |  |  |  |  |  |  | 3,470,022 | 1,539,480 | 1,452,402
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (318,101) | (391,543) | (169,468)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (33,758) | (31,052) | (28,428)
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (4,992) | (4,182) | (3,563)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  | 7,811 | 10,089 | 7,283
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | 1,819 | 1,736 | 1,020
Net cash used in financing activities |  |  |  |  |  |  |  |  | 15,878 | (13,098) | (39,529)
Cash, beginning of year |  |  |  | 898 |  |  |  | 23,959 | 898 | 23,959 | 193
Cash, end of year | 458 |  |  |  | 898 |  |  |  | 458 | 898 | 23,959
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 158,495 | 165,861 | 141,827
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity In Undistributed Income Of Continuing Subsidiaries, Net Of Tax |  |  |  |  |  |  |  |  | (135,425) | (141,495) | (115,203)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 10,449 | 8,973 | 8,702
Net realized losses (gains) |  |  |  |  |  |  |  |  | 220 | 0 | (2)
Amortization - other |  |  |  |  |  |  |  |  | 648 | 740 | 1,421
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Increase in accrued long-term stock compensation |  |  |  |  |  |  |  |  | 5,564 | 4,575 | 1,062
(Increase) decrease in net federal income taxes |  |  |  |  |  |  |  |  | (3,612) | (3,052) | 10,977
(Decrease) increase in other assets |  |  |  |  |  |  |  |  | (202) | (12) | 1,165
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 80 | (202) | (120)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 36,217 | 35,388 | 49,829
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | (45,789) | (33,717) | (18,511)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 14,983 | 21,578 | 23,210
Sale of fixed income securities, available for sale |  |  |  |  |  |  |  |  | 18,768 | 0 | 300
Purchase of short-term investments |  |  |  |  |  |  |  |  | (119,501) | (106,933) | (102,717)
Sale of short-term investments |  |  |  |  |  |  |  |  | 130,841 | 94,422 | 101,510
Net cash (used in) provided by investing activities |  |  |  |  |  |  |  |  | (698) | (24,650) | 3,792
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (33,758) | (31,052) | (28,428)
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (4,992) | (4,182) | (3,563)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  | 7,811 | 10,089 | 7,283
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | 1,819 | 1,736 | 1,020
Principal payments of borrowings from subsidiaries |  |  |  |  |  |  |  |  | (6,839) | (2,798) | (13,759)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (35,959) | (26,207) | (37,447)
Net (decrease) increase in cash |  |  |  |  |  |  |  |  | (440) | (15,469) | 16,174
Cash, beginning of year |  |  |  | $ 898 |  |  |  | $ 16,367 | 898 | 16,367 | 193
Cash, end of year | $ 458 |  |  |  | $ 898 |  |  |  | $ 458 | $ 898 | $ 16,367

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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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