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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |
Net income | $ 434,883 | $ 489,876
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 435,878 | 593,527
Impairment charges | 20,444 | 701,523
Stock-based compensation expense | 59,605 | 28,478
Deferred income taxes | 200,056 | (132,781)
Equity investment income (loss), net | 8,611 | 19,071
Gain on sales of business interests, net | (57,547) | (23,402)
Other non-cash charges, net | 164,856 | 41,703
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures: |  |
Accounts receivable | (74,622) | (146,024)
Inventories | 88,355 | 14,272
Other receivables and other current assets | (757) | (43,556)
Other long-term assets | 2,142 | (13,831)
Accounts payable | (12,800) | 18,595
Accrued compensation and benefits | 40,225 | (60,063)
Other current liabilities | 45,624 | 39,445
Income taxes | 21,749 | 22,669
Other long-term liabilities | 5,546 | 18,648
Net cash provided by operating activities | 1,382,248 | 1,568,150
Cash flows from investing activities: |  |
Additions of property and equipment | (705,659) | (639,829)
Acquisitions | (113,526) | (726,538)
Proceeds from asset and business sales | 135,268 | 92,529
Purchase of investments available for sale | (5,791) | (9,882)
Purchase of investments held-to-maturity | (3,728) | (223,482)
Proceeds from sale of investments available for sale | 8,783 | 5,822
Proceeds from investments held-to-maturity | 32,628 | 398,765
Purchase of equity investments | (12,874) | (3,014)
Distributions received on equity investments | 3,580 | 80
Net cash used in investing activities | (661,319) | (1,105,549)
Cash flows from financing activities: |  |
Borrowings | 41,674,279 | 38,160,821
Payments on long-term debt and other financing costs | (40,828,443) | (38,269,284)
Purchase of treasury stock | (1,161,511) | (321,411)
Stock award exercises and other share issuances, net | 8,803 | 15,781
Distributions to noncontrolling interests | (139,673) | (165,463)
Contributions from noncontrolling interests | 43,179 | 51,156
Proceeds from sales of additional noncontrolling interests | 15 | 0
Purchases of noncontrolling interests | (19,988) | (1,432)
Net cash used in financing activities | (423,339) | (529,832)
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (5,790) | 5,449
Net decrease in cash, cash equivalents and restricted cash from continuing operations | 291,800 | (61,782)
Cash, cash equivalents and restricted cash of continuing operations at beginning of the year | 518,920 | 683,463
Cash, cash equivalents and restricted cash of continuing operations at end of the period | 540,155 | 538,987
Discontinued Operations |  |
Cash flows from financing activities: |  |
Net decrease in cash, cash equivalents and restricted cash from continuing operations | 270,565 | 82,694
Continuing Operations |  |
Cash flows from financing activities: |  |
Net decrease in cash, cash equivalents and restricted cash from continuing operations | $ 21,235 | $ (144,476)

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