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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities |  |  |
Net income | $ 369,448 | $ 308,276 | $ 304,881
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 109,124 | 116,499 | 96,101
Amortization of debt issuance costs (including loss on extinguishment of debt) | 2,678 | 2,248 | 1,779
Amortization of acquired intangible assets | 58,448 | 43,343 | 32,612
Write-down of intangible assets and property, plant and equipment | 915 | 14,083 | 3,511
Reserve for doubtful receivables/allowance for credit losses | 1,487 | 5,707 | 7,443
Unrealized loss (gain) on revaluation of foreign currency asset/liability | (8,304) | 9,578 | (5,171)
Stock-based compensation expense | 81,968 | 74,008 | 83,885
Deferred tax benefit | (9,263) | (22,587) | (16,315)
Write-down of operating lease right-of-use assets and other assets | 0 | 18,084 | 0
Gain on exchange of non-monetary asset | 0 | 0 | (31,380)
Others, net | 623 | (1,291) | (2,213)
Change in operating assets and liabilities: |  |  |
(Increase) decrease in accounts receivable | (11,803) | 42,505 | (121,983)
(Increase) decrease in prepaid expenses, other current assets, contract cost assets, operating lease right-of-use assets and other assets | 83,432 | (99,852) | (69,813)
Increase (decrease) in accounts payable | 11,740 | (12,480) | (21,375)
Increase (decrease) in accrued expenses, other current liabilities, operating lease liabilities and other liability | (2,057) | 87,180 | 157,580
Increase (decrease) in income taxes payable | 5,845 | (993) | 8,346
Net cash provided by operating activities | 694,281 | 584,308 | 427,888
Investing activities |  |  |
Purchase of property, plant and equipment | (53,341) | (70,170) | (74,927)
Payment for internally generated intangible assets (including intangibles under development) | (3,907) | (10,201) | (33,834)
Proceeds from sale of property, plant and equipment and intangibles assets | 6,384 | 607 | 1,750
Proceeds from sale of equity affiliates | 0 | 0 | 2,168
Payment for business acquisitions, net of cash acquired | (72,025) | (186,633) | (252,276)
Proceed from sale of investment | 142 | 0 | 0
Net cash used for investing activities | (122,747) | (266,397) | (357,119)
Financing activities |  |  |
Repayment of finance lease obligations | (13,926) | (10,567) | (7,380)
Payment of debt issuance costs | (3,029) | (620) | (2,317)
Proceeds from long-term debt | 350,000 | 0 | 400,000
Repayment of long-term debt | (34,002) | (34,000) | (34,000)
Proceeds from short-term borrowings | 0 | 610,000 | 400,000
Repayment of short-term borrowings | (250,000) | (430,000) | (625,000)
Proceeds from issuance of common shares under stock-based compensation plans | 35,051 | 25,135 | 19,670
Payment for net settlement of stock-based awards | (35,717) | (34,083) | (3,850)
Payment of earn-out consideration | (2,556) | (6,552) | (12,790)
Dividend paid | (80,479) | (74,212) | (64,671)
Payment for stock repurchased and retired (including expenses related to stock repurchase) | (298,219) | (137,112) | (30,015)
Others | (6) | 0 | 0
Net cash provided by/ (used for) financing activities | (332,883) | (92,011) | 39,647
Effect of exchange rate changes | (19,633) | (12,556) | (11,716)
Net increase in cash and cash equivalents | 238,651 | 225,900 | 110,416
Cash and cash equivalents at the beginning of the period | 680,440 | 467,096 | 368,396
Cash and cash equivalents at the end of the period | 899,458 | 680,440 | 467,096
Supplementary information |  |  |
Cash paid during the period for interest (including interest rate swaps) | 46,348 | 49,101 | 45,084
Cash paid during the period for income taxes, net of refunds | 31,761 | 193,946 | 104,217
Property, plant and equipment acquired under finance lease obligations | 286 | 29,526 | 5,008
Non-cash transaction: Gain on exchange of non-monetary asset | $ 0 | $ 0 | $ (31,380)

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