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Consolidated Statements of Cash Flows - 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: |  |  |
Depreciation and amortization | 55,109 | 59,350 | 55,205
Stock-based compensation expense | 15,893 | 16,227 | 19,077
Undistributed gains of equity method investments | (69,873) | (12,408) | (12,773)
Distributions in excess of current year income of equity method investments | 2,910 | 3,472 | 2,807
Net realized and unrealized (gains) losses | (17,599) | 4,217 | (14,422)
Loss on disposal of fixed assets | 50 | 22 | 42
Changes in assets and liabilities: |  |  |
Increase in reserve for loss and loss expense, net of reinsurance recoverable | 307,972 | 181,839 | 149,232
Increase in unearned premiums, net of prepaid reinsurance | 172,460 | 91,278 | 82,253
(Increase) decrease in net federal income taxes | (542) | 7,708 | 7,721
Increase in premiums receivable | (109,173) | (13,171) | (53,383)
Increase in Deferred Policy Acquisition Costs | (38,337) | (17,392) | (18,574)
Increase in accrued investment income | (3,243) | (158) | (3,226)
Increase (decrease) in accrued salaries and benefits | 7,216 | (13,264) | (3,748)
Increase in other assets | (33,379) | (27,927) | (39,337)
Increase in other liabilities | 78,121 | 27,897 | 34,998
Net cash provided by operating activities | 771,422 | 554,045 | 477,495
Investing Activities |  |  |
Purchase of fixed income securities, held-to-maturity | (16,250) | 0 | 0
Purchase of fixed income securities, available-for-sale | (2,165,555) | (1,723,818) | (1,856,125)
Purchase of commercial mortgage loans | (50,204) | (46,506) | 0
Purchase of other investments | (85,044) | (79,598) | (64,908)
Purchase of short-term investments | (4,345,140) | (5,762,725) | (6,087,909)
Sale of fixed income securities, available-for-sale | 502,911 | 487,087 | 594,743
Proceeds from commercial mortgage loans | 714 | 201 | 0
Sale of short-term investments | 4,306,684 | 5,635,463 | 6,129,885
Redemption and maturities of fixed income securities, held-to-maturity | 4,192 | 3,888 | 16,149
Redemption and maturities of fixed income securities, available-for-sale | 1,217,555 | 1,019,132 | 626,686
Sale of equity securities | 99,235 | 1,320 | 137,294
Sale of other investments | 5,428 | 5,375 | 17,964
Distributions from other investments | 17,497 | 24,884 | 19,972
Fixed asset disposals | 0 | 0 | 9
Purchase of property and equipment | (22,163) | (22,064) | (30,986)
Net cash used in investing activities | (618,780) | (688,174) | (543,623)
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
Proceeds from borrowings | 0 | 587,000 | 355,757
Repayment of borrowings | (50,000) | (587,000) | (250,000)
Repayment of finance lease obligations | (1,768) | (550) | (977)
Net cash (used in) provided by financing activities | (122,810) | 141,385 | 57,184
Net increase (decrease) in cash and restricted cash | 29,832 | 7,256 | (8,944)
Cash and restricted cash, beginning of year | 15,231 | 7,975 | 16,919
Cash and restricted cash, end of year | 45,063 | 15,231 | 7,975
Payments to Acquire Equity Securities, FV-NI | $ (88,640) | $ (230,813) | $ (46,397)

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