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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 (loss) | $ (8,515) | $ 340,099 | $ 280,372
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 474,959 | 368,098 | 334,589
Stock based compensation expense | 6,802 | 10,274 | 13,105
Write-off of maintenance assets | 3,255 |  |
Increase in credit loss reserves | 17,087 |  |
Loss on disposal of fixed assets | 445 |  |
Net increase in deferred income taxes | 6,100 | 109,654 | 99,139
Gain on sale of ExpressJet subsidiary |  | (46,525) |
Special items |  | 21,869 |
Changes in operating assets and liabilities: |  |  |
Decrease (increase) in receivables | 26,831 | (40,700) | (21,464)
Decrease (increase) in income tax receivable | 7,225 | 14,795 | (20,620)
Decrease (increase) in inventories | 19,307 | (4,303) | (7,935)
Decrease in other current assets | 8,233 | 2,707 | 77,484
Decrease in operating lease right-of-use assets | 53,647 |  |
Increase in operating lease liabilities | (65,557) | (895) |
Increase in deferred revenue | 110,728 |  |
Decrease in deferred aircraft credits |  |  | (14,243)
Increase (decrease) in accounts payable and other current liabilities | (26,984) | (54,043) | 62,107
NET CASH PROVIDED BY OPERATING ACTIVITIES | 633,563 | 721,030 | 802,534
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of marketable securities | (1,347,775) | (1,938,750) | (2,308,768)
Sales of marketable securities | 1,170,556 | 1,866,761 | 2,451,344
Net cash received from sale of ExpressJet subsidiary |  | 53,200 |
Acquisition of property and equipment: |  |  |
Aircraft and rotable spare parts | (425,618) | (581,329) | (1,062,380)
Buildings and ground equipment | (12,678) | (80,586) | (34,397)
Proceeds from the sale of aircraft, property and equipment | 3,239 | 26,008 |
Deposits on aircraft | (9,625) | (52,817) | (41,937)
Return of deposits applied towards acquired aircraft | 27,858 | 46,346 | 49,550
Decrease (increase) in other assets | (89,428) | 4,133 | (36,816)
NET CASH USED IN INVESTING ACTIVITIES | (683,471) | (657,034) | (983,404)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of long-term debt | 406,364 | 200,040 | 784,665
Principal payments on long-term debt | (187,404) | (382,442) | (370,775)
Net proceeds from issuance of common stock | 2,819 | 6,271 | 5,212
Purchase of treasury stock | (20,000) | (78,476) | (54,448)
Purchase of common stock |  | (16,145) |
Employee income tax paid on vested equity awards | (6,165) | (9,313) | (13,556)
Payment of debt issuance cost | (4,130) | (1,642) | (3,892)
Payment of cash dividends | (13,059) | (23,467) | (19,744)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | 178,425 | (305,174) | 327,462
Increase (decrease) in cash and cash equivalents | 128,517 | (241,178) | 146,592
Cash and cash equivalents at beginning of period | 87,206 | 328,384 | 181,792
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 215,723 | 87,206 | 328,384
Non-cash investing and financing activities: |  |  |
Acquisition of rotable spare parts | 22,187 | 16,514 | 367
Debt assumed on aircraft acquired under operating leases |  | 14,475 | 59,132
Engines contributed to joint venture |  | 22,313 |
Non-cash assets used to acquire aircraft under operating leases |  | 153,566 |
Lease liability arising from the recognition of right-of-use asset |  | 456,472 |
Warrants issued under CARES Act agreements | 8,248 |  |
Cash paid during the period for: |  |  |
Interest, net of capitalized amounts | 125,440 | 131,733 | 118,268
Income taxes | $ 1,780 | 2,490 | $ 2,661
SUPPLEMENTAL DISCLOSURE OF SALE OF SUBSIDIARY: |  |  |
Decrease in carrying amount of assets |  | (101,448) |
Decrease in carrying amount of liabilities |  | 68,341 |
Cash received from buyers |  | 79,632 |
Gain on sale of subsidiary |  | $ 46,525 |

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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition Cash outflow for origination of loan for purchasing common stock. + 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 The cash outflow for acquisition of long-lived depreciable flight assets, including owned aircraft or capital improvements. + References No definition available. + Details
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