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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