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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Gross revenue $ 2,595,777 $ 2,402,321 $ 2,364,956
Reimbursable expenses   (643,882) (698,469)
Total revenue 2,595,777 1,758,439 1,666,487
Costs and expenses:      
Selling, general and administrative 325,794 323,741 325,726
Depreciation and amortization 65,916 61,297 59,575
Restructuring (Note 14) 12,490 7,753 8,159
Total costs and expenses 2,222,420 1,420,101 1,354,793
Income from operations 373,357 338,338 311,694
Interest income 4,759 2,346 1,484
Interest expense (13,502) (12,627) (13,006)
Income before income taxes expense 364,614 328,057 300,172
Income tax expense (Note 13) (41,958) (46,569) (37,993)
Net income $ 322,656 $ 281,488 $ 262,179
Net income per ordinary share:      
Basic (dollars per share) $ 5.96 $ 5.20 $ 4.75
Diluted (dollars per share) $ 5.89 $ 5.13 $ 4.65
Weighted average number of ordinary shares outstanding:      
Basic (in shares) 54,118,764 54,129,439 55,248,900
Diluted (in shares) 54,790,663 54,849,046 56,407,136
Direct Costs      
Costs and expenses:      
Direct costs $ 1,818,220 $ 1,027,310 $ 961,333