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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities: |  |
Net income | $ 490,334 | $ 642,576
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 344,120 | 335,390
Stock-based compensation expense | 50,109 | 51,717
Deferred income taxes | 9,069 | 40,685
Equity investment loss (income), net | 90 | (2,764)
Other non-cash charges, net | (32,858) | 1,274
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures: |  |
Accounts receivable | (132,043) | (117,171)
Inventories | (1,927) | (3,270)
Other receivables and prepaid and other current assets | (61,811) | 14,465
Other long-term assets | (49,093) | (13,706)
Accounts payable | 24,517 | (47,390)
Accrued compensation and benefits | (102,513) | (90,381)
Other current liabilities | 42,517 | 25,090
Income taxes | (63,638) | 10,753
Other long-term liabilities | (6,557) | (13,232)
Net cash provided by operating activities | 510,316 | 834,036
Cash flows from investing activities: |  |
Additions of property and equipment | (265,461) | (294,438)
Acquisitions | (9,491) | (23,890)
Proceeds from asset and business sales | 114,829 | 29,774
Purchase of debt investments held-to-maturity | (89,530) | (7,923)
Purchase of other debt and equity investments | (3,010) | (2,164)
Proceeds from debt investments held-to-maturity | 8,415 | 7,923
Proceeds from sale of other debt and equity investments | 3,775 | 11,908
Purchase of equity method investments | (23,806) | (6,029)
Distributions from equity method investments | 1,047 | 1,140
Net cash used in investing activities | (263,232) | (283,699)
Cash flows from financing activities: |  |
Borrowings | 1,182,911 | 1,611,086
Payments on long-term debt | (841,687) | (754,407)
Deferred financing and debt redemption costs | 0 | (9,089)
Purchase of treasury stock | (617,432) | (560,507)
Distributions to noncontrolling interests | (118,315) | (99,362)
Net payments related to stock purchases and awards | (47,866) | (43,605)
Contributions from noncontrolling interests | 9,116 | 15,925
Proceeds from sales of additional noncontrolling interests | 3,673 | 0
Purchases of noncontrolling interests | (15,365) | (4,493)
Net cash (used in) provided by financing activities | (444,965) | 155,548
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (1,342) | (1,197)
Net (decrease) increase in cash, cash equivalents and restricted cash | (199,223) | 704,688
Cash, cash equivalents and restricted cash at beginning of the year | 554,960 | 501,790
Cash, cash equivalents and restricted cash at end of the period | $ 355,737 | $ 1,206,478

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