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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Cash flows from operating activities: |  |
Net income | $ 116,654 | $ 111,970
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 145,126 | 141,405
Impairment of long lived assets | 6,933 | 3,574
Reduction in carrying value of operating right-of-use assets | 11,304 | 13,077
Loss on equity method investments | 383 | 785
Charge on cash flow hedge | 2,253 | 0
Amortization of financing costs and debt discount | 4,497 | 5,781
Stock compensation expense | 14,759 | 18,903
Deferred taxes | (43,823) | (34,702)
Foreign exchange movements | (1,319) | (7,323)
Other non-cash items | 17,534 | (2,895)
Changes in operating assets and liabilities: |  |
Accounts receivable | (93,259) | (35,461)
Unbilled revenue | (18,346) | (55,427)
Unearned revenue | 80,990 | (16,812)
Other net assets | (68,186) | 84,041
Net cash provided by operating activities | 175,500 | 226,916
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | (26,744) | (19,632)
Sale of available for sale investments | 482 | 0
Purchase of available for sale investments | (422) | 0
Sale of investments in equity - long term | 0 | 96
Sale of investments in equity - long term | (1,358) | 0
Net cash used in investing activities | (28,042) | (19,536)
Cash flows from financing activities: |  |
Drawdown of bank credit lines and loan facilities | 180,000 | 0
Repayment of bank credit lines and loan facilities | (350,000) | (300,000)
Proceeds from exercise of equity compensation | 12,940 | 7,491
Share issue costs | (4) | (3)
Repurchase of ordinary shares | 0 | (99,983)
Share repurchase costs | 0 | (17)
Net cash used in financing activities | (157,064) | (392,512)
Effect of exchange rate movements on cash | 718 | (7,983)
Net decrease in cash and cash equivalents | (8,888) | (193,115)
Cash and cash equivalents at beginning of period | 288,768 | 752,213
Cash and cash equivalents at end of period | $ 279,880 | $ 559,098

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