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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:          
Net income $ 73,865,000 $ 47,760,000 $ 170,987,000 $ 140,089,000  
Adjustments to reconcile net income to net cash provided by operating activities:          
(Gain)/loss on disposal of property, plant and equipment     (5,000) 95,000  
Depreciation expense     25,940,000 22,643,000  
Impairment of right-of-use assets 0   0 5,411,000 $ 5,400,000
Reduction in carrying value of operating right-of-use assets     14,037,000 14,337,000  
Amortization of intangibles     8,741,000 9,537,000  
Amortization of government grants     (24,000) (22,000)  
Interest on non-current operating lease liability     870,000 1,006,000  
Realized gain on sale of short term investments     0 (232,000)  
Gain on re-measurement of financial assets     (4,750,000) 0  
Loss on equity method investments 509,000 0 783,000 0  
Stock compensation expense 8,480,000 7,117,000 14,874,000 13,186,000  
Amortization of interest rate hedge     891,000 (482,000)  
Amortization of financing costs     1,592,000 258,000  
Loss on extinguishment of debt     14,434,000 0  
Deferred taxes     3,313,000 (2,613,000)  
Changes in assets and liabilities:          
Decrease in accounts receivable     36,650,000 58,170,000  
Decrease in unbilled revenue     12,690,000 12,226,000  
Decrease in other receivables     2,406,000 2,689,000  
Decrease in prepayments and other current assets     5,748,000 2,937,000  
(Increase)/decrease in other non-current assets     (1,748,000) 486,000  
Increase in unearned revenue     14,534,000 25,056,000  
Decrease in other current liabilities     (50,981,000) (33,507,000)  
Decrease in operating lease liabilities     (14,951,000) (15,416,000)  
Increase in other non-current liabilities     1,151,000 2,355,000  
Decrease in income taxes payable     (3,583,000) (5,931,000)  
(Decrease)/increase in accounts payable     (13,245,000) 8,370,000  
Net cash provided by operating activities     240,354,000 260,648,000  
Cash flows from investing activities:          
Purchase of property, plant and equipment     (21,653,000) (21,161,000)  
Purchase of subsidiary undertakings     0 (47,367,000)  
Purchase of equity method investments     (2,450,000) 0  
Cash acquired with subsidiary undertaking     0 10,170,000  
Sale of available for sale investments     0 47,902,000  
Purchase of investments in equity - long term     (1,771,000) (1,273,000)  
Net cash used in investing activities     (25,874,000) (11,729,000)  
Cash flows from financing activities:          
Proceeds from exercise of equity compensation     182,000 1,461,000  
Share issue costs     (10,000) (6,000)  
Repurchase of ordinary shares     0 (175,000,000)  
Share repurchase costs     0 (140,000)  
Net cash provided by (used in) financing activities     172,000 (173,685,000)  
Effect of exchange rate movements on cash     539,000 (3,443,000)  
Net increase in cash and cash equivalents     215,191,000 71,791,000  
Cash and cash equivalents at beginning of period     840,305,000 520,309,000 520,309,000
Cash and cash equivalents at end of period $ 1,055,496,000 $ 592,100,000 $ 1,055,496,000 $ 592,100,000 $ 840,305,000