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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash flows from operating activities: |  |
Net income | $ 291,545 | $ 287,895
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 165,701 | 154,679
Debt refinancing charges | 0 | 884
Stock-based compensation expense | 23,595 | 19,870
Deferred income taxes | 18,688 | 103,301
Equity investment income, net | (2,924) | (9,482)
Other non-cash charges, net | 3,979 | 5,055
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures: |  |
Accounts receivable | (224,274) | (32,966)
Inventories | (5,303) | 1,835
Other receivables and prepaid and other current assets | 13,756 | (24,965)
Other long-term assets | (6,521) | 2,673
Accounts payable | (75,504) | (24,045)
Accrued compensation and benefits | (126,330) | (96,428)
Other current liabilities | 26,970 | 3,982
Income taxes | 62,719 | (32,616)
Other long-term liabilities | (11,793) | 709
Net cash provided by operating activities | 154,304 | 360,381
Cash flows from investing activities: |  |
Additions of property and equipment | (144,913) | (154,942)
Acquisitions | (3,668) | (34,107)
Proceeds from asset and business sales | 16,337 | 31,518
Purchase of debt investments held-to-maturity | (5,349) | (5,049)
Purchase of other debt and equity investments | (1,779) | (2,633)
Proceeds from debt investments held-to-maturity | 5,349 | 5,049
Proceeds from sale of other debt and equity investments | 11,879 | 3,268
Purchase of equity method investments | (3,200) | (6,174)
Distributions from equity method investments | 978 | 445
Net cash used in investing activities | (124,366) | (162,625)
Cash flows from financing activities: |  |
Borrowings | 1,606,969 | 570,779
Payments on long-term debt | (698,298) | (104,592)
Deferred financing costs | (8,346) | (350)
Purchase of treasury stock | (316,250) | (321,798)
Distributions to noncontrolling interests | (53,867) | (58,131)
Net (payments) receipts related to stock purchases and awards | (2,524) |
Net (payments) receipts related to stock purchases and awards |  | 2,397
Contributions from noncontrolling interests | 10,689 | 9,387
Purchases of noncontrolling interests | (1,095) | (700)
Net cash provided by financing activities | 537,278 | 96,992
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (7,966) | (14,978)
Net increase in cash, cash equivalents and restricted cash | 559,250 | 279,770
Cash, cash equivalents and restricted cash of continuing operations at beginning of the year | 501,790 | 1,208,718
Cash, cash equivalents and restricted cash of continuing operations at end of the year | 1,061,040 | 1,488,488
Discontinued Operations |  |
Cash flows from financing activities: |  |
Net increase in cash, cash equivalents and restricted cash | 0 | 0
Continuing Operations |  |
Cash flows from financing activities: |  |
Net increase in cash, cash equivalents and restricted cash | $ 559,250 | $ 279,770

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