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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |  |
NET CASH PROVIDED BY OPERATING ACTIVITIES | $ 573,127 |  | $ 532,289
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of marketable securities | (1,575,991) |  | (1,002,624)
Sales of marketable securities | 1,699,284 |  | 843,509
Proceeds from the sale of aircraft, property and equipment |  |  | 51,079
Acquisition of property and equipment: |  |  |
Aircraft and rotable spare parts | (848,723) |  | (563,524)
Deposits on aircraft |  |  | (46,733)
Buildings and ground equipment | (35,870) |  | (8,275)
Aircraft deposits applied towards acquired aircraft | 21,421 |  | 36,533
Increase in other assets | (2,479) |  | (5,019)
NET CASH USED IN INVESTING ACTIVITIES | (742,358) |  | (695,054)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of long-term debt | 626,163 |  | 384,825
Principal payments on long-term debt | (262,923) |  | (245,745)
Net proceeds from issuance of common stock | 5,212 |  | 3,447
Purchase of treasury stock and employee income tax paid on equity awards | (38,720) |  | (14,330)
Increase in debt issuance cost | (3,182) |  | (3,245)
Payment of cash dividends | (14,550) |  | (10,868)
NET CASH PROVIDED BY FINANCING ACTIVITIES | 312,000 |  | 114,084
Increase (decrease) in cash and cash equivalents | 142,769 |  | (48,681)
Cash and cash equivalents at beginning of period | 181,792 | [1] | 146,766
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 324,561 |  | 98,085
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Acquisition of rotable spare parts | 10,346 |  |
Debt assumed on aircraft acquired off lease | 59,132 |  |
Cash paid during the period for: |  |  |
Interest, net of capitalized amounts | 85,611 |  | 77,915
Income taxes | $ 2,382 |  | $ 2,354
[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 contained in Part I, Item 1 of this report for additional information.

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