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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS |  |  |
NET CASH PROVIDED BY OPERATING ACTIVITIES | $ 350,822 |  | $ 331,783
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of marketable securities | (1,377,448) |  | (738,101)
Sales of marketable securities | 1,407,623 |  | 665,246
Proceeds from the sale of aircraft, property and equipment |  |  | 50,652
Acquisition of property and equipment: |  |  |
Aircraft and rotable spare parts | (553,877) |  | (514,443)
Buildings and ground equipment | (19,070) |  | (2,420)
Aircraft deposits applied towards acquired aircraft |  |  | 16,824
Increase in other assets | (4,962) |  | (6,098)
NET CASH USED IN INVESTING ACTIVITIES | (547,734) |  | (528,340)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of long-term debt | 383,644 |  | 384,825
Principal payments on long-term debt | (160,387) |  | (169,550)
Net proceeds from issuance of common stock | 2,320 |  | 1,783
Purchase of treasury stock and employee income tax paid on equity awards | (23,467) |  | (13,871)
Increase in debt issuance cost | (1,917) |  | (3,221)
Payment of cash dividends | (9,345) |  | (6,727)
NET CASH PROVIDED BY FINANCING ACTIVITIES | 190,848 |  | 193,239
Decrease in cash and cash equivalents | (6,064) |  | (3,318)
Cash and cash equivalents at beginning of period | 181,792 | [1] | 146,766
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 175,728 |  | 143,448
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Acquisition of rotable spare parts | 426 |  | 2,038
Debt assumed on aircraft acquired off lease | 59,132 |  |
Cash paid during the period for: |  |  |
Interest, net of capitalized amounts | 54,765 |  | 50,943
Income taxes | $ 1,852 |  | $ 598
[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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