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Parent Corporation Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 81,859 | $ 56,150 | $ 72,266 | $ 61,348 | $ 45,760 | $ 55,435 | $ 58,819 | $ 18,925 | $ 271,623 | $ 178,939 | $ 168,826
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 19,077 | 14,507 | 12,089
Net realized (gains) losses |  |  |  |  |  |  |  |  | (23,071) | 25,554 | (6,359)
Amortization - other |  |  |  |  |  |  |  |  | 55,205 | 44,874 | 52,100
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Decrease in net federal income taxes |  |  |  |  |  |  |  |  | 7,721 | 2,428 | 30,918
Increase in other assets |  |  |  |  |  |  |  |  | (39,337) | (372) | (2,643)
Increase in other liabilities |  |  |  |  |  |  |  |  | 34,998 | (13,343) | 27,297
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | (1,856,125) | (2,918,203) | (2,130,362)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 626,686 | 638,916 | 555,216
Sale of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 594,743 | 2,030,664 | 1,197,920
Purchase of equity securities |  |  |  |  |  |  |  |  | (46,397) | (94,344) | (61,931)
Sale of equity securities |  |  |  |  |  |  |  |  | 137,294 | 113,339 | 37,960
Purchase of short-term investments |  |  |  |  |  |  |  |  | (6,087,909) | (4,259,734) | (4,280,553)
Sale of short-term investments |  |  |  |  |  |  |  |  | 6,129,885 | 4,101,530 | 4,338,318
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (47,675) | (42,097) | (37,045)
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (8,164) | (6,556) | (6,015)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  | 8,243 | 7,252 | 7,599
Cash, beginning of year |  |  |  | 505 |  |  |  |  | 505 |  |
Cash, end of year | 300 |  |  |  | 505 |  |  |  | 300 | 505 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 271,623 | 178,939 | 168,826
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiaries, net of tax |  |  |  |  |  |  |  |  | (205,963) | (116,087) | (131,797)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 19,077 | 14,507 | 12,089
Net realized (gains) losses |  |  |  |  |  |  |  |  | (207) | 1,567 | 15
Amortization - other |  |  |  |  |  |  |  |  | 4,614 | 567 | 678
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
(Decrease) increase in accrued long-term stock compensation |  |  |  |  |  |  |  |  | (12,970) | (15,443) | 4,988
Decrease in net federal income taxes |  |  |  |  |  |  |  |  | 1,651 | 11,246 | 3,811
Increase in other assets |  |  |  |  |  |  |  |  | (533) | (343) | (60)
Increase in other liabilities |  |  |  |  |  |  |  |  | 3,919 | 1,712 | 714
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 81,211 | 76,665 | 59,264
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | (153,482) | (75,046) | (58,832)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 10,579 | 6,849 | 10,465
Sale of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  | 20,189 | 45,099 | 31,819
Purchase of equity securities |  |  |  |  |  |  |  |  | (10,824) | 0 | 0
Sale of equity securities |  |  |  |  |  |  |  |  | 10,828 | 0 | 0
Purchase of short-term investments |  |  |  |  |  |  |  |  | (1,116,766) | (207,115) | (185,590)
Sale of short-term investments |  |  |  |  |  |  |  |  | 1,116,253 | 195,846 | 179,292
Net cash used in investing activities |  |  |  |  |  |  |  |  | (123,223) | (34,367) | (22,846)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (47,675) | (42,097) | (37,045)
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (8,164) | (6,556) | (6,015)
Proceeds from issuance of notes payable, net of debt issuance costs |  |  |  |  |  |  |  |  | 290,757 | 0 | 0
Principal payment on notes payable |  |  |  |  |  |  |  |  | (185,000) | 0 | 0
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  | 8,243 | 7,252 | 7,599
Principal payments of borrowings from subsidiaries |  |  |  |  |  |  |  |  | (16,354) | (926) | (881)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 41,807 | (42,327) | (36,342)
Net (decrease) increase in cash |  |  |  |  |  |  |  |  | (205) | (29) | 76
Cash, beginning of year |  |  |  | $ 505 |  |  |  | $ 534 | 505 | 534 | 458
Cash, end of year | $ 300 |  |  |  | $ 505 |  |  |  | $ 300 | $ 505 | $ 534

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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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