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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 827,706 | $ 786,103 | $ 974,175
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Depreciation expense | 707,331 | 661,578 | 631,196
Amortization of deferred financing costs | 7,454 | 7,346 | 7,939
Amortization of debt discount | 1,880 | 1,591 | 1,701
Loss on extinguishment of debt, net | 9,333 | 602 | 17,492
Amortization of stock-based compensation | 21,603 | 25,621 | 20,280
Equity in loss of, and return on, unconsolidated real estate entities and noncontrolling interests, net of eliminations | 8,673 | 12,278 | 6,583
Casualty and impairment gain, net | 0 | 0 | 826
Abandonment of development pursuits | 9,262 | 2,943 | 501
Unrealized Gain (Loss) on Derivatives | (2,894) | 0 | 0
Cash flow hedge losses reclassified to earnings | 8,984 | 6,571 | 6,143
Gain on sale of real estate assets | (346,041) | (172,332) | (385,976)
Gain (Loss) on Sale of Other Investments | (8,213) | 0 | 0
(Increase) decrease in resident security deposits, prepaid expenses and other assets | (28,675) | (19,118) | 12,583
Increase in accrued expenses, other liabilities and accrued interest payable | 3,212 | 8,621 | 7,668
Net cash provided by operating activities | 1,219,615 | 1,321,804 | 1,301,111
Cash flows from investing activities: |  |  |
Development/redevelopment of real estate assets including land acquisitions and deferred development costs | (843,907) | (1,052,011) | (1,139,954)
Acquisition of real estate assets, including partnership interest | 0 | (420,517) | (338,620)
Capital expenditures - existing real estate assets | (108,531) | (135,626) | (83,607)
Payments for Capital Improvements, Non Real Estate | (28,505) | (5,266) | (3,325)
Increase (decrease) in payables for construction | 1,474 | (4,848) | 11,606
Proceeds from sale of real estate, net of selling costs | 619,773 | 422,041 | 883,313
Proceeds from Sale of Other Real Estate | 202,033 | 0 | 0
Mortgage note receivable lending | (258) | (692) | (3,699)
Mortgage note receivable payments | 3,419 | 2,779 | 53,136
Distributions from unconsolidated real estate entities | 11,157 | 10,454 | 35,516
Investments in unconsolidated real estate entities | (36,088) | (10,183) | (11,017)
Net cash used in investing activities | (179,433) | (1,193,869) | (596,651)
Cash flows from financing activities: |  |  |
Issuance of common stock, net | 3,464 | 409,725 | 52,261
Payments for Repurchase of Common Stock | (183,876) | 0 |
Payments of Ordinary Dividends | (883,212) | (839,646) | (805,239)
Proceeds from Secured Notes Payable | 51,000 | 30,250 | 295,939
Repayments of mortgage notes payable, including prepayment penalties | (126,712) | (227,570) | (255,452)
Issuance of unsecured notes | 1,296,581 | 449,804 | 299,442
Repayment of unsecured notes, including prepayment penalties | (958,680) | 0 | (258,579)
Payment of deferred financing costs | (11,277) | (10,909) | (16,258)
Finance Lease, Principal Payments | 0 | 0 | (1,070)
(Payment) receipt for termination of forward interest rate swaps | (25,135) | (12,309) | 12,598
Proceeds from (Payments to) Noncontrolling Interests | (68) | 456 | 0
Payments related to tax withholding for share-based compensation | (14,917) | (16,101) | (10,556)
Distributions to DownREIT partnership unitholders | (48) | (46) | (44)
Payments of Distributions to Affiliates | (384) | (439) | (424)
Preferred interest obligation redemption and dividends | (1,000) | (1,400) | (1,120)
Net cash used in financing activities | (854,264) | (218,185) | (688,502)
Net increase in cash, cash equivalents and cash in escrow | 185,918 | (90,250) | 15,958
Cash and cash equivalents and restricted cash, beginning of year | 127,614 | 217,864 | 201,906
Cash and cash equivalents and restricted cash, end of year | 313,532 | 127,614 | 217,864
Cash paid during the year for interest, net of amount capitalized | 196,848 | 187,570 | 201,659
Supplemental Cash Flow Information [Abstract] |  |  |
Cash and cash equivalents and restricted cash, end of year | $ 313,532 | $ 127,614 | $ 201,906

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- Definition The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow from the purchase of receivables arising from the mortgage note on real estate. + 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of other real estate investments held by the entity for investment purposes not otherwise defined in the taxonomy. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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