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CONDENSED 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 | $ 227,704 | $ 170,987
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 285,424 | 34,681
Impairment of long lived assets | 20,749 | 0
Reduction in carrying value of operating right-of-use assets | 23,570 | 14,037
Loss on equity method investments | 1,641 | 783
Charge on interest rate hedge | 0 | 891
Amortization of financing costs and debt discount | 9,188 | 1,592
Stock compensation expense | 38,186 | 14,874
Loss on extinguishment of debt | 0 | 14,434
Deferred taxes | (75,265) | 3,313
Unrealized foreign exchange gain | (37,421) | 2,586
Other non-cash items | 9,159 | (3,909)
Changes in operating assets and liabilities: |  |
Accounts receivable | (41,032) | 36,650
Unbilled revenue | (33,187) | 12,690
Unearned revenue | (176,904) | 14,534
Other net assets | 157,154 | (77,789)
Net cash provided by operating activities | 408,966 | 240,354
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | (47,840) | (21,653)
Purchase of equity method investment | 0 | (2,450)
Purchase of investments in equity - long term | (799) | (1,771)
Net cash used in investing activities | (48,639) | (25,874)
Cash flows from financing activities: |  |
Proceeds from exercise of equity compensation | 15,140 | 182
Share issue costs | (3) | (10)
Repurchase of ordinary shares | (99,983) | 0
Share repurchase costs | (17) | 0
Drawdown of bank credit lines and loan facilities | 25,000 | 0
Repayment of bank credit lines and loan facilities | (425,000) | 0
Net cash used in financing activities | (484,863) | 172
Effect of exchange rate movements on cash | (12,759) | 539
Net (decrease)/ increase in cash and cash equivalents | (137,295) | 215,191
Cash and cash equivalents at beginning of period | 752,213 | 840,305
Cash and cash equivalents at end of period | $ 614,918 | $ 1,055,496

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