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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |
Net income | $ 587,121 | $ 510,835 | $ 756,152
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation of flight equipment | 702,810 | 581,985 | 508,352
Stock-based compensation | 20,745 | 17,478 | 19,804
Deferred taxes | 92,049 | 129,303 | (146,622)
Amortization of prepaid lease costs | 32,849 | 24,579 | 19,265
Amortization of discounts and debt issuance costs | 36,691 | 32,706 | 29,454
Gain on aircraft sales, trading and other activity | (81,994) | (34,442) | (74,337)
Changes in operating assets and liabilities: |  |  |
Other assets | (161,302) | (74,223) | (108,623)
Accrued interest and other payables | 139,337 | 51,175 | 50,832
Rentals received in advance | 24,166 | 14,705 | 5,436
Net cash provided by operating activities | 1,392,472 | 1,254,101 | 1,059,713
Investing Activities |  |  |
Acquisition of flight equipment under operating lease | (3,663,605) | (2,512,582) | (1,972,009)
Payments for deposits on flight equipment purchases | (884,459) | (976,101) | (773,981)
Proceeds from aircraft sales, trading and other activity | 995,345 | 391,372 | 779,489
Acquisition of aircraft furnishings, equipment and other assets | (291,258) | (287,509) | (177,450)
Net cash used in investing activities | (3,843,977) | (3,384,820) | (2,143,951)
Financing Activities |  |  |
Issuance of common stock upon exercise of options and warrants | 44,885 | 4,826 | 9,264
Issuance of preferred stock | 242,130 |  |
Cash dividends paid on Class A common stock | (58,026) | (41,563) | (30,933)
Preferred dividends paid | (11,958) |  |
Tax withholdings on stock-based compensation | (4,272) | (7,548) | (6,926)
Net change in unsecured revolving facilities | (582,000) | (245,000) | 81,000
Proceeds from debt financings | 3,567,728 | 3,533,885 | 2,183,824
Payments in reduction of debt financings | (978,369) | (1,270,505) | (1,303,499)
Debt issuance costs | (11,280) | (11,475) | (5,855)
Security deposits and maintenance reserve receipts | 310,220 | 242,524 | 226,064
Security deposits and maintenance reserve disbursements | (52,490) | (59,709) | (51,221)
Net cash provided by financing activities | 2,466,568 | 2,145,435 | 1,101,718
Net increase in cash | 15,063 | 14,716 | 17,480
Cash, cash equivalents and restricted cash at beginning of period | 322,998 | 308,282 | 290,802
Cash, cash equivalents and restricted cash at end of period | 338,061 | 322,998 | 308,282
Supplemental Disclosure of Cash Flow Information |  |  |
Cash paid during the period for interest, including capitalized interest of $59,358, $52,817 and $46,049 at December 31, 2019, 2018 and 2017, respectively | 442,132 | 332,426 | 301,741
Cash paid for income taxes | 16,657 | 4,264 | 5,497
Supplemental Disclosure of Noncash Activities |  |  |
Buyer furnished equipment, capitalized interest, deposits on flight equipment purchases and seller financing applied to acquisition of flight equipment and other assets applied to payments for deposits on flight equipment purchases | 1,399,136 | 912,075 | 644,206
Cash dividends declared, not yet paid | $ 17,003 | $ 14,421 | $ 10,359

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