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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income (loss) | $ 428,907 | $ (161,586) | $ 117,817
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 292,768 | 284,969 | 264,507
Stock based compensation expense | 10,580 | 7,568 | 5,368
Gain from early extinguishment of debt |  | (1,279) | (33,660)
Special items |  | 465,649 |
Net increase (decrease) in deferred income taxes | (145,517) | (83,441) | 73,844
Changes in operating assets and liabilities: |  |  |
Decrease (increase) in restricted cash | 8,243 | (27) | 3,366
Decrease in receivables | 4,201 | 15,260 | 21,076
Decrease (increase) in income tax receivable | 1,673 | (4,118) | (92)
Increase in inventories | (1,246) | (1,986) | (2,860)
Decrease (increase) in other current assets | 26,017 | 37,569 | (28,598)
Decrease in deferred aircraft credits | (8,520) | (8,108) | (8,635)
Increase (decrease) in accounts payable and accrued aircraft rents | 46,934 | (47,563) | 9,690
Increase (decrease) in other current liabilities | 20,084 | 3,758 | (4,498)
NET CASH PROVIDED BY OPERATING ACTIVITIES | 684,124 | 506,665 | 417,325
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of marketable securities | (1,533,867) | (2,511,388) | (1,170,439)
Sales of marketable securities | 1,440,283 | 2,388,168 | 1,299,069
Proceeds from the sale of aircraft, property and equipment | 51,994 | 3,008 | 10,308
Proceeds from settlement of residual value guarantee aircraft agreements |  | 90,000 |
Acquisition of property and equipment: |  |  |
Aircraft and rotable spare parts | (661,176) | (1,138,963) | (710,871)
Deposits on aircraft | (46,733) | (650) |
Buildings and ground equipment | (27,467) | (14,350) | (10,405)
Return of deposits applied towards acquired aircraft | 36,533 |  | 1,850
Decrease (increase) in other assets | (10,904) | 7,097 | 10,772
NET CASH USED IN INVESTING ACTIVITIES | (751,337) | (1,177,078) | (569,716)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of long-term debt | 471,677 | 926,069 | 591,881
Principal payments on long-term debt | (330,258) | (302,158) | (354,277)
Proceeds from issuance of common stock | 4,660 | 8,142 | 9,754
Purchase of treasury stock | (20,008) |  | (18,726)
Employee income tax paid on equity awards | (5,080) |  |
Decrease (increase) in debt issuance cost | (3,737) | (8,653) | 2,779
Payment of cash dividends | (15,015) | (9,256) | (8,260)
NET CASH PROVIDED BY FINANCING ACTIVITIES | 102,239 | 614,144 | 223,151
Increase (decrease) in cash and cash equivalents | 35,026 | (56,269) | 70,760
Cash and cash equivalents at beginning of period | 146,766 | 203,035 | 132,275
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 181,792 | 146,766 | 203,035
Non-cash investing activities: |  |  |
Acquisition of rotable spare parts | 755 | 5,688 |
Cash paid during the period for: |  |  |
Interest, net of capitalized amounts | 105,639 | 76,589 | 80,657
Income taxes | $ 5,010 | $ 1,212 | $ 5,104

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&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/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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