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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Cash flows from operating activities: |  |
Net income | $ 395,917 | $ 387,859
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 436,217 | 427,285
Impairment of long lived assets | 8,845 | 27,727
Reduction in carrying value of operating right-of-use assets | 33,979 | 35,238
Loss on equity method investments | 383 | 2,643
Acquisition-related gain | (6,160) | 0
Charge on cash flow hedge | 3,335 | 0
Amortization of financing costs and debt discount | 12,485 | 13,544
Stock compensation expense | 47,303 | 55,703
Deferred taxes | (114,487) | (126,620)
Foreign exchange movements | (7,670) | (52,334)
Other non-cash items | 21,966 | 18,595
Changes in operating assets and liabilities: |  |
Accounts receivable | (139,096) | (140,760)
Unbilled revenue | 14,370 | (221,104)
Unearned revenue | 158,269 | 28,352
Other net assets | (144,760) | 166,613
Net cash provided by operating activities | 720,896 | 622,741
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | (87,980) | (85,145)
Purchase of subsidiary undertakings | (5,100) | 0
Sale of available for sale investments | 1,611 | 0
Purchase of available for sale investments | (1,852) | 0
Purchase of investments in equity - long term | (10,829) | (1,840)
Net cash used in investing activities | (104,150) | (86,985)
Cash flows from financing activities: |  |
Drawdown of bank credit lines and loan facilities | 305,000 | 25,000
Repayment of bank credit lines and loan facilities | (930,000) | (625,000)
Proceeds from exercise of equity compensation | 36,517 | 28,967
Share issue costs | (14) | (3)
Repurchase of ordinary shares | 0 | (99,983)
Share repurchase costs | 0 | (17)
Net cash used in financing activities | (588,497) | (671,036)
Effect of exchange rate movements on cash | (3,952) | (7,775)
Net increase (decrease) in cash and cash equivalents | 24,297 | (143,055)
Cash and cash equivalents at beginning of period | 288,768 | 752,213
Cash and cash equivalents at end of period | $ 313,065 | $ 609,158

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