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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Cash flows from operating activities: |  |
Net income | $ 111,970 | $ 97,122
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 141,405 | 19,837
Impairment of long lived assets | 3,574 | 0
Reduction in carrying value of operating right-of-use assets | 13,077 | 4,683
Loss on equity method investments | 785 | 274
Charge on interest rate hedge | 0 | 56
Amortization of financing costs and debt discount | 5,781 | 139
Stock compensation expense | 18,903 | 6,394
Deferred tax benefit | (34,702) | (664)
Unrealized foreign exchange gain | (7,323) | (1,060)
Other non-cash items | (2,895) | (744)
Changes in operating assets and liabilities: |  |
Accounts receivable | (35,461) | 52,015
Unbilled revenue | (55,427) | 11,796
Unearned revenue | (16,812) | (50,079)
Other net assets | 84,041 | (27,849)
Net cash provided by operating activities | 226,916 | 111,920
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | (19,632) | (8,704)
Sale/ (purchase) of investments in equity - long term | 96 | (599)
Net cash used in investing activities | (19,536) | (9,303)
Cash flows from financing activities: |  |
Proceeds from exercise of equity compensation | 7,491 | 5
Share issue costs | (3) | (5)
Repurchase of ordinary shares | (99,983) | 0
Share repurchase costs | (17) | 0
Repayment of bank credit lines and loan facilities | (300,000) | 0
Net cash used in financing activities | (392,512) | 0
Effect of exchange rate movements on cash | (7,983) | (467)
Net (decrease)/ increase in cash and cash equivalents | (193,115) | 102,150
Cash and cash equivalents at beginning of period | 752,213 | 840,305
Cash and cash equivalents at end of period | $ 559,098 | $ 942,455

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- Definition The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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