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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Cash flows from operating activities: |  |  |  |  |
Net cash provided by operating activities |  |  | $ 273,980 |  | $ 173,545
Cash flows from investing activities: |  |  |  |  |
Proceeds from sale of property and equipment |  |  | 32 |  | 141
Purchases of property and equipment |  |  | (4,880) |  | (14,580)
Purchases of equity securities |  |  | (46,532) |  | (11,145)
Purchases of available-for-sale debt securities |  |  | (354,907) |  | (735,426)
Purchases of investment real estate, net |  |  | (7) |  | (6)
Proceeds from sales of equity securities | $ 48,486 |  | 53,651 |  | 0
Proceeds from sales of available-for-sale debt securities |  |  | 76,516 |  | 757,812
Proceeds from sales of investment real estate |  |  | 2,591 |  | 0
Proceeds from sale of assets held for sale |  |  | 8,856 |  | 0
Maturities of available-for-sale debt securities |  |  | 70,095 |  | 115,543
Net cash provided by (used in) investing activities |  |  | (194,585) |  | 112,339
Cash flows from financing activities: |  |  |  |  |
Preferred stock dividend |  |  | (8) |  | (8)
Common stock dividend |  |  | (15,104) |  | (15,516)
Purchase of treasury stock |  |  | (1,609) |  | (26,501)
Payments related to tax withholding for share-based compensation |  |  | (784) |  | (1,253)
Repayment of debt |  |  | (1,103) |  | (1,103)
Net cash provided by (used in) financing activities |  |  | (18,608) |  | (44,381)
Cash and cash equivalents, and restricted cash and cash equivalents: |  |  |  |  |
Net increase (decrease) during the period |  |  | 60,787 |  | 241,503
Balance, beginning of period |  |  | 179,871 |  | 184,744
Balance, end of period | 240,658 |  | 240,658 |  | 426,247
Cash and cash equivalents, and restricted cash and cash equivalents within the Consolidated Balance Sheets |  |  |  |  |
Cash and cash equivalents | 224,822 |  | 224,822 |  |
Restricted cash and cash equivalents | 15,836 | [1] | 15,836 | [1] |
Total cash and cash equivalents and restricted cash and cash equivalents | $ 240,658 |  | $ 240,658 |  | $ 426,247
[1] | See “—Note 5 (Insurance Operations)” for a discussion of the nature of the restrictions for restricted cash and cash equivalents and “—Note 14 (Variable Interest Entities)” for a discussion of restricted cash held in a trust account.

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