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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Cash Flows [Abstract] |  |  |  |
Net (loss) income |  | $ (294,923) | $ 1,166,777 | $ 1,017,497
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 1,645,373 | 1,676,121 | 1,679,074
Asset impairment |  | 1,086,983 | 70,149 | 44,186
Amortization of debt issuance costs, debt discount, debt premium and lease premium |  | 64,970 | 79,645 | 76,499
Amortization of fair value adjustments on debt |  | (47,279) | (79,098) | (142,596)
Maintenance rights write-off | [1] | 133,015 | 244,748 | 287,119
Maintenance liability release to income |  | (344,210) | (207,849) | (228,081)
Net gain on sale of assets |  | (89,618) | (188,835) | (201,323)
Deferred income taxes |  | (20,882) | 162,498 | 147,588
Share-based compensation |  | 69,187 | 69,410 | 95,176
Collections of finance and sales-type leases |  | 68,128 | 98,365 | 0
Loss on investment at fair value |  | 143,510 | 0 | 0
Loss on debt extinguishment |  | 118,460 | 0 | 0
Other |  | 252,350 | 96,117 | 60,452
Changes in operating assets and liabilities: |  |  |  |
Trade receivables |  | (128,188) | (8,751) | 19,839
Other assets |  | (400,316) | (73,646) | 9,800
Accounts payable, accrued expenses and other liabilities |  | (126,177) | 31 | (24,858)
Net cash provided by operating activities |  | 2,130,383 | 3,105,682 | 2,840,372
Purchase of flight equipment |  | (778,547) | (3,359,092) | (4,036,194)
Proceeds from sale or disposal of assets |  | 471,437 | 1,773,766 | 1,822,601
Prepayments on flight equipment |  | (405,178) | (1,369,400) | (1,912,215)
Collections of finance and sales-type leases |  | 0 | 0 | 94,703
Other |  | 0 | (17) | (21,505)
Net cash used in investing activities |  | (712,288) | (2,954,743) | (4,052,610)
Issuance of debt |  | 10,946,333 | 6,539,310 | 5,589,825
Repayment of debt |  | (11,560,015) | (6,504,830) | (4,360,520)
Debt issuance and extinguishment costs paid, net of debt premium received |  | (253,806) | (36,592) | (57,831)
Maintenance payments received |  | 345,699 | 736,423 | 743,256
Maintenance payments returned |  | (412,492) | (352,032) | (459,326)
Security deposits received |  | 137,130 | 232,219 | 208,259
Security deposits returned |  | (297,469) | (233,222) | (220,452)
Dividend paid to non-controlling interest holders and others |  | (2,935) | (6,341) | (8,403)
Repurchase of shares and tax withholdings on share-based compensation |  | (127,777) | (639,941) | (834,398)
Net cash (used in) provided by financing activities |  | (1,225,332) | (265,006) | 600,410
Net increase (decrease) in cash, cash equivalents and restricted cash |  | 192,763 | (114,067) | (611,828)
Effect of exchange rate changes |  | 2,180 | (621) | 2,738
Cash, cash equivalents and restricted cash at beginning of period |  | 1,300,347 | 1,415,035 | 2,024,125
Cash, cash equivalents and restricted cash at end of period |  | 1,495,290 | 1,300,347 | 1,415,035
Supplemental cash flow information: |  |  |  |
Interest paid, net of amounts capitalized |  | 1,196,467 | 1,270,532 | 1,228,788
Income taxes (refunded) paid, net |  | $ (3,862) | $ 2,352 | $ 679
[1] | Maintenance rights write-off consisted of the following:
End of lease ("EOL") and Maintenance Reserved ("MR") contract maintenance rights expense | $ | 45,655 |  |  | $ | 76,611 |  |  | $ | 157,792 |
MR contract maintenance rights write-off due to maintenance liability release | 35,897 |  |  | 19,848 |  |  | 29,656 |
EOL contract maintenance rights write-off due to cash receipt | 51,463 |  |  | 148,289 |  |  | 99,671 |
Maintenance rights write-off | $ | 133,015 |  |  | $ | 244,748 |  |  | $ | 287,119 |

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