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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |
Net income (loss) |  | $ 280,372 | $ 428,907 |  | $ (161,586) |
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |  |  |  |
Depreciation and amortization |  | 334,589 | 292,768 | [1] | 284,969 | [1]
Stock based compensation expense |  | 13,105 | 10,580 |  | 7,568 |
Gain from early extinguishment of debt |  |  |  |  | (1,279) |
Special items | [1] |  |  |  | 465,649 |
Net increase (decrease) in deferred income taxes |  | 99,139 | (145,517) |  | (83,441) |
Changes in operating assets and liabilities: |  |  |  |  |  |
Decrease (increase) in restricted cash |  |  | 8,243 |  | (27) |
Decrease (increase) in receivables |  | (21,464) | 4,201 |  | 15,260 |
Decrease (increase) in income tax receivable |  | (20,620) | 1,673 |  | (4,118) |
Increase in inventories |  | (7,935) | (1,246) |  | (1,986) |
Decrease in other current assets |  | 77,484 | 26,017 |  | 37,569 |
Decrease in deferred aircraft credits |  | (14,243) | (8,520) |  | (8,108) |
Increase (decrease) in accounts payable and accrued aircraft rents |  | 56,076 | 46,934 |  | (47,563) |
Increase in other current liabilities |  | 6,031 | 20,084 |  | 3,758 |
NET CASH PROVIDED BY OPERATING ACTIVITIES |  | 802,534 | 684,124 |  | 506,665 |
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |
Purchases of marketable securities |  | (2,308,768) | (1,533,867) |  | (2,511,388) |
Sales of marketable securities |  | 2,451,344 | 1,440,283 |  | 2,388,168 |
Proceeds from the sale of aircraft, property and equipment |  |  | 51,994 |  | 3,008 |
Proceeds from settlement of residual value guarantee aircraft agreements |  |  |  |  | 90,000 |
Acquisition of property and equipment: |  |  |  |  |  |
Aircraft and rotable spare parts |  | (1,062,380) | (661,176) |  | (1,138,963) |
Deposits on aircraft |  | (41,937) | (46,733) |  | (650) |
Buildings and ground equipment |  | (34,397) | (27,467) |  | (14,350) |
Return of deposits applied towards acquired aircraft |  | 49,550 | 36,533 |  |  |
Decrease (increase) in other assets |  | (36,816) | (10,904) |  | 7,097 |
NET CASH USED IN INVESTING ACTIVITIES |  | (983,404) | (751,337) |  | (1,177,078) |
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |
Proceeds from issuance of long-term debt |  | 784,665 | 471,677 |  | 926,069 |
Principal payments on long-term debt |  | (370,775) | (330,258) |  | (302,158) |
Proceeds from issuance of common stock |  | 5,212 | 4,660 |  | 8,142 |
Purchase of treasury stock |  | (54,448) | (20,008) |  |  |
Employee income tax paid on vested equity awards |  | (13,556) | (5,080) |  |  |
Decrease (increase) in debt issuance cost |  | (3,892) | (3,737) |  | (8,653) |
Payment of cash dividends |  | (19,744) | (15,015) |  | (9,256) |
NET CASH PROVIDED BY FINANCING ACTIVITIES |  | 327,462 | 102,239 |  | 614,144 |
Increase (decrease) in cash and cash equivalents |  | 146,592 | 35,026 |  | (56,269) |
Cash and cash equivalents at beginning of period |  | 181,792 | 146,766 |  | 203,035 |
CASH AND CASH EQUIVALENTS AT END OF PERIOD |  | 328,384 | 181,792 |  | 146,766 |
Non-cash investing activities: |  |  |  |  |  |
Acquisition of rotable spare parts |  | 367 | 755 |  | 5,688 |
Debt assumed on aircraft acquired off lease |  | 59,132 |  |  |  |
Cash paid during the period for: |  |  |  |  |  |
Interest, net of capitalized amounts |  | 118,268 | 105,639 |  | 76,589 |
Income taxes |  | $ 2,661 | $ 5,010 |  | $ 1,212 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + 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=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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=109223946&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + 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=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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