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Parent Corporation Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Activities |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 45,760 | [1] | $ 55,435 | $ 58,819 | $ 18,925 | $ 30,242 | [1] | $ 46,718 | $ 41,426 | $ 50,440 | $ 178,939 | $ 168,826 | $ 158,495
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | 14,507 | 12,089 | 10,449
Net realized losses |  |  |  |  |  |  |  |  |  |  | 25,554 | (6,359) | 4,937
Amortization - other |  |  |  |  |  |  |  |  |  |  | 44,874 | 52,100 | 61,671
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease (increase) in net federal income taxes |  |  |  |  |  |  |  |  |  |  | 2,428 | 30,918 | 11,150
Increase in other assets |  |  |  |  |  |  |  |  |  |  | 372 | 2,643 | 4,979
Increase in other liabilities |  |  |  |  |  |  |  |  |  |  | (13,343) | 27,297 | 9,191
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 454,944 | 379,545 | 329,509
Investing Activities |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  |  |  | (2,918,203) | (2,130,362) | (1,982,023)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  |  |  | 638,916 | 555,216 | 641,524
Sale of fixed income securities, available for sale |  |  |  |  |  |  |  |  |  |  | 12,106 | 58,832 | 102,868
Purchase of short-term investments |  |  |  |  |  |  |  |  |  |  | (4,259,734) | (4,280,553) | (3,499,380)
Sale of short-term investments |  |  |  |  |  |  |  |  |  |  | 4,101,530 | 4,338,318 | 3,470,022
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  | (435,688) | (332,658) | (320,736)
Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  |  |  | (42,097) | (37,045) | (33,758)
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  | (6,556) | (6,015) | (4,992)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  |  |  | 7,252 | 7,599 | 7,811
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 1,819
Net cash used in financing activities |  |  |  |  |  |  |  |  |  |  | (47,047) | (39,582) | 15,878
Cash, beginning of year |  |  |  |  | 534 |  |  |  |  |  | 534 |  |
Cash, end of year | 505 |  |  |  |  | 534 |  |  |  |  | 505 | 534 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 178,939 | 168,826 | 158,495
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiaries, net of tax |  |  |  |  |  |  |  |  |  |  | (116,087) | (131,797) | (135,425)
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | 14,507 | 12,089 | 10,449
Net realized losses |  |  |  |  |  |  |  |  |  |  | 1,567 | 15 | 220
Amortization - other |  |  |  |  |  |  |  |  |  |  | 567 | 678 | 648
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
(Decrease) increase in accrued long-term stock compensation |  |  |  |  |  |  |  |  |  |  | (15,443) | 4,988 | 5,564
Decrease (increase) in net federal income taxes |  |  |  |  |  |  |  |  |  |  | 11,246 | 3,811 | (3,612)
Increase in other assets |  |  |  |  |  |  |  |  |  |  | (343) | (60) | (202)
Increase in other liabilities |  |  |  |  |  |  |  |  |  |  | 1,712 | 714 | 80
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 76,665 | 59,264 | 36,217
Investing Activities |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  |  |  | (75,046) | (58,832) | (45,789)
Redemption and maturities of fixed income securities, available-for-sale |  |  |  |  |  |  |  |  |  |  | 6,849 | 10,465 | 14,983
Sale of fixed income securities, available for sale |  |  |  |  |  |  |  |  |  |  | 45,099 | 31,819 | 18,768
Purchase of short-term investments |  |  |  |  |  |  |  |  |  |  | (207,115) | (185,590) | (119,501)
Sale of short-term investments |  |  |  |  |  |  |  |  |  |  | 195,846 | 179,292 | 130,841
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  | (34,367) | (22,846) | (698)
Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  |  |  | (42,097) | (37,045) | (33,758)
Acquisition of treasury stock |  |  |  |  |  |  |  |  |  |  | (6,556) | (6,015) | (4,992)
Net proceeds from stock purchase and compensation plans |  |  |  |  |  |  |  |  |  |  | 7,252 | 7,599 | 7,811
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 1,819
Principal payments of borrowings from subsidiaries |  |  |  |  |  |  |  |  |  |  | (926) | (881) | (6,839)
Net cash used in financing activities |  |  |  |  |  |  |  |  |  |  | (42,327) | (36,342) | (35,959)
Net (decrease) increase in cash |  |  |  |  |  |  |  |  |  |  | (29) | 76 | (440)
Cash, beginning of year |  |  |  |  | $ 534 |  |  |  |  | $ 458 | 534 | 458 | 898
Cash, end of year | $ 505 |  |  |  |  | $ 534 |  |  |  |  | $ 505 | $ 534 | $ 458
[1] | Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.

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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=109223946&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=114873790&loc=SL114874131-224263 + 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://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=109223946&loc=d3e3602-108585 + Details
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