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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 | $ 333,040 | $ 830,555 | $ 1,033,082
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 591,035 | 777,485 | 720,252
Impairment charges | 61,981 | 981,589 | 296,408
Valuation adjustment on disposal group | 316,840 | 0 | 0
Stock-based compensation expense | 73,061 | 35,092 | 38,338
Deferred income taxes | 273,660 | (395,217) | 52,010
Equity investment income, net | 26,449 | 28,925 | 17,766
Gain on sales of business interests, net | (85,699) | (23,402) | (404,165)
Other non-cash charges, net | 82,374 | 66,920 | (7,343)
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures: |  |  |
Accounts receivable | (81,176) | (156,305) | (152,240)
Inventories | 73,505 | (18,625) | 22,920
Other receivables and other current assets | 236,995 | (111,432) | (45,351)
Other long-term assets | 3,497 | (11,945) | 35,893
Accounts payable | (35,959) | 26,876 | 11,897
Accrued compensation and benefits | 84,165 | (78,239) | 68,272
Other current liabilities | (157,462) | 1,908 | 176,494
Income taxes | (23,635) | (52,176) | 77,376
Other long-term liabilities | (1,031) | 11,157 | 30,517
Net cash provided by operating activities | 1,771,640 | 1,913,166 | 1,972,126
Cash flows from investing activities: |  |  |
Additions of property and equipment | (987,138) | (905,250) | (829,095)
Acquisitions | (183,156) | (803,879) | (563,856)
Proceeds from asset and business sales | 150,205 | 92,336 | 64,725
Purchase of investments available for sale | (8,448) | (13,117) | (13,539)
Purchase of investments held-to-maturity | (5,963) | (228,990) | (1,133,192)
Proceeds from sale of investments available for sale | 9,526 | 6,408 | 18,963
Proceeds from investments held-to-maturity | 34,862 | 492,470 | 1,240,502
Purchase of equity investments | (19,177) | (4,816) | (27,096)
Proceeds from sale of equity investments | 0 | 0 | 40,920
Distributions received on equity investments | 3,646 | 106 | 0
Net cash used in investing activities | (1,005,643) | (1,364,732) | (1,201,668)
Cash flows from financing activities: |  |  |
Borrowings | 59,934,750 | 50,991,960 | 51,991,490
Payments on long-term debt and other financing costs | (59,239,973) | (50,837,112) | (52,116,120)
Purchase of treasury stock | (1,161,511) | (802,949) | (1,097,822)
Distributions to noncontrolling interests | (196,441) | (211,467) | (192,401)
Stock award exercises and other share issuances, net | 13,577 | 21,252 | 23,543
Excess tax benefits from stock award exercises | 0 | 0 | 13,251
Contributions from noncontrolling interests | 52,311 | 74,552 | 47,590
Proceeds from sales of additional noncontrolling interests | 15 | 2,864 | 0
Purchases of noncontrolling interests | (28,082) | (5,357) | (21,512)
Net cash used in financing activities | (625,354) | (766,257) | (1,351,981)
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (3,350) | 254 | 4,276
Less: Net increase (decrease) in cash, cash equivalents and restricted cash from discontinued operations | 137,293 | (217,569) | (577,247)
Cash, cash equivalents and restricted cash of continuing operations at beginning of the year | 518,920 | 683,463 | 1,244,917
Cash, cash equivalents and restricted cash of continuing operations at end of the year | 415,420 | 518,920 | 683,463
Discontinued Operations |  |  |
Cash flows from financing activities: |  |  |
Less: Net increase (decrease) in cash, cash equivalents and restricted cash from discontinued operations | 240,793 | (53,026) | (15,793)
Continuing Operations |  |  |
Cash flows from financing activities: |  |  |
Less: Net increase (decrease) in cash, cash equivalents and restricted cash from discontinued operations | $ (103,500) | $ (164,543) | $ (561,454)

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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 Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + 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 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + 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 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=109223946&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + 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 the sale or maturity of long-term held-to-maturity securities. + 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://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 associated with the sale of debt and equity securities classified as available-for-sale securities. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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