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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Cash flows from operating activities: |  |  |
Net income | $ 187,438 | $ 116,654 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization expense | 149,181 | 145,126 |
Impairment of long lived assets | 0 | 6,933 |
Reduction in carrying value of operating right-of-use assets | 11,472 | 11,304 |
Loss on equity method investments | 0 | 383 |
Amortization of financing costs and debt discount | 3,907 | 4,497 |
Stock compensation expense | 13,181 | 14,759 |
Deferred tax benefit | (35,145) | (43,823) |
Unrealized foreign exchange movements | (1,027) | (1,319) |
Other non-cash items | 4,629 | 17,534 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (80,431) | (93,259) |
Unbilled revenue | (42,546) | (18,346) |
Unearned revenue | 56,485 | 80,990 |
Other net assets | 59,932 | (65,933) |
Net cash provided by operating activities | 327,076 | 175,500 |
Cash flows from investing activities: |  |  |
Purchase of property, plant and equipment | (27,152) | (26,744) |
Purchase of subsidiary undertakings (net of cash acquired) | (7,831) | 0 |
Sale of available for sale investments | 1,005 | 482 |
Purchase of available for sale investments | (1,006) | (422) |
Purchase of investments in equity - long term | (4,381) | (1,358) |
Net cash used in investing activities | (39,365) | (28,042) |
Cash flows from financing activities: |  |  |
Drawdown of credit lines and loan facilities | 50,000 | 180,000 |
Repayment of credit lines and loan facilities | (330,000) | (350,000) |
Proceeds from exercise of equity compensation | 16,305 | 12,940 |
Share issue costs | (4) | (4) |
Net cash used in financing activities | (263,699) | (157,064) |
Effect of exchange rate movements on cash | (6,032) | 718 |
Net increase / (decrease) in cash and cash equivalents | 17,980 | (8,888) |
Cash and cash equivalents at beginning of period | 378,102 | 288,768 | $ 288,768
Cash and cash equivalents at end of period | $ 396,082 | $ 279,880 | $ 378,102

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