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Parent Corporation Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |
Net income | $ 403,837 | $ 246,355 | $ 271,623
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Stock-based compensation expense | 15,893 | 16,227 | 19,077
Undistributed losses of equity method investments | (69,873) | (12,408) | (12,773)
Amortization - other | 55,109 | 59,350 | 55,205
Changes in assets and liabilities: |  |  |
Decrease in net federal income taxes | (542) | 7,708 | 7,721
Increase in other assets | (33,379) | (27,927) | (39,337)
(Decrease) increase in other liabilities | 78,121 | 27,897 | 34,998
Investing Activities |  |  |
Purchase of fixed income securities, available-for-sale | (2,165,555) | (1,723,818) | (1,856,125)
Purchase of short-term investments | (4,345,140) | (5,762,725) | (6,087,909)
Purchase of other investments | (85,044) | (79,598) | (64,908)
Redemption and maturities of fixed income securities, available-for-sale | 1,217,555 | 1,019,132 | 626,686
Sale of fixed income securities, available-for-sale | 502,911 | 487,087 | 594,743
Sale of equity securities | 99,235 | 1,320 | 137,294
Sale of short-term investments | 4,306,684 | 5,635,463 | 6,129,885
Proceeds from Sale of Other Investments | 959 | 0 | 0
Financing Activities |  |  |
Dividends to preferred stockholders | (9,353) | 0 | 0
Dividends to common stockholders | (60,136) | (54,486) | (47,675)
Acquisition of treasury stock | (9,050) | (7,053) | (8,164)
Net proceeds from stock purchase and compensation plans | 7,976 | 8,411 | 8,243
Preferred stock issued, net of issuance costs | (479) | 195,063 | 0
Cash, beginning of year | 394 |  |
Cash, end of year | 455 | 394 |
Payments to Acquire Equity Securities, FV-NI | (88,640) | (230,813) | (46,397)
Parent Company [Member] |  |  |
Operating Activities |  |  |
Net income | 403,837 | 246,355 | 271,623
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Equity in undistributed income of subsidiaries, net of tax | (297,220) | (176,146) | (205,963)
Stock-based compensation expense | 15,893 | 16,227 | 19,077
Net realized and unrealized investment gains | (1,898) | (1,756) | (207)
Undistributed losses of equity method investments | (1,859) | 672 | 0
Amortization - other | 1,076 | 1,080 | 4,614
Changes in assets and liabilities: |  |  |
Increase (decrease) in accrued long-term stock compensation | 2,727 | (366) | (12,970)
Decrease in net federal income taxes | 3,843 | 5,549 | 1,651
Increase in other assets | (7,251) | (317) | (533)
(Decrease) increase in other liabilities | (1,742) | (390) | 3,919
Net cash provided by operating activities | 117,406 | 90,908 | 81,211
Investing Activities |  |  |
Purchase of fixed income securities, available-for-sale | (113,829) | (89,726) | (153,482)
Purchase of short-term investments | (330,843) | (523,961) | (1,116,766)
Purchase of other investments | (4,949) | (4,065) | 0
Redemption and maturities of fixed income securities, available-for-sale | 51,524 | 26,877 | 10,579
Sale of fixed income securities, available-for-sale | 15,713 | 23,276 | 20,189
Sale of equity securities | 31,204 | 0 | 10,828
Sale of short-term investments | 311,225 | 523,813 | 1,116,253
Capital contribution to subsidiaries | 0 | (30,000) | 0
Net cash used in investing activities | (44,672) | (231,197) | (123,223)
Financing Activities |  |  |
Dividends to preferred stockholders | (9,353) | 0 | 0
Dividends to common stockholders | (60,136) | (54,486) | (47,675)
Acquisition of treasury stock | (9,050) | (7,053) | (8,164)
Proceeds from borrowings | 0 | 50,000 | 290,757
Repayment of borrowings | 0 | (50,000) | (185,000)
Net proceeds from stock purchase and compensation plans | 7,976 | 8,411 | 8,243
Preferred stock issued, net of issuance costs | (479) | 195,063 | 0
Principal payments of borrowings from subsidiaries | (1,631) | (1,552) | (16,354)
Net cash (used in) provided by financing activities | (72,673) | 140,383 | 41,807
Net increase (decrease) in cash | 61 | 94 | (205)
Cash, beginning of year | 394 | 300 | 505
Cash, end of year | 455 | 394 | 300
Payments to Acquire Equity Securities, FV-NI | $ (5,676) | $ (157,411) | $ (10,824)

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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are 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 13 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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