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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income $ 232,252 $ 227,704
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 290,185 285,424
Impairment of long lived assets 8,613 20,749
Reduction in carrying value of operating right-of-use assets 23,607 23,570
Loss on equity method investments 383 1,641
Acquisition-related gain (6,160) 0
Charge on cash flow hedge 3,646 0
Amortization of financing costs and debt discount 7,899 9,188
Stock compensation expense 31,357 38,186
Deferred taxes (59,177) (75,265)
Foreign exchange movements (3,345) (37,421)
Other non-cash items 18,202 9,159
Changes in operating assets and liabilities:    
Accounts receivable (40,675) (41,032)
Unbilled revenue (27,210) (33,187)
Unearned revenue 65,266 (176,904)
Other net assets (165,462) 157,154
Net cash provided by operating activities 379,381 408,966
Cash flows from investing activities:    
Purchase of property, plant and equipment (58,880) (47,840)
Purchase of subsidiary undertakings (5,100) 0
Sale of available for sale investments 482 0
Purchase of available for sale investments (422) 0
Purchase of investments in equity - long term (4,733) (799)
Net cash used in investing activities (68,653) (48,639)
Cash flows from financing activities:    
Drawdown of bank credit lines and loan facilities 230,000 25,000
Repayment of bank credit lines and loan facilities (580,000) (425,000)
Proceeds from exercise of equity compensation 20,177 15,140
Share issue costs (9) (3)
Repurchase of ordinary shares 0 (99,983)
Share repurchase costs 0 (17)
Net cash used in financing activities (329,832) (484,863)
Effect of exchange rate movements on cash 512 (12,759)
Net decrease in cash and cash equivalents (18,592) (137,295)
Cash and cash equivalents at beginning of period 288,768 752,213
Cash and cash equivalents at end of period $ 270,176 $ 614,918