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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Revenue   $ 591,781   $ 1,169,847
Reimbursable expenses   160,758   306,870
Total Revenue $ 641,610 431,023 $ 1,261,735 862,977
Costs and expenses:        
Direct costs
Direct Costs, Reimbursable Expenses 169,313 0 328,066 0
Direct Costs, Other 279,913 250,044 551,752 500,503
Selling, general and administrative expense 80,936 80,833 161,851 162,222
Depreciation and amortization 17,046 14,395 33,944 28,843
Restructuring 12,490 7,753 12,490 7,753
Total costs and expenses 559,698 353,025 1,088,103 699,321
Income from operations 81,912 77,998 173,632 163,656
Interest income 1,017 579 1,840 1,134
Interest expense (3,302) (3,179) (7,097) (6,358)
Income before provision for income taxes 79,627 75,398 168,375 158,432
Provision for income taxes (7,759) (10,581) (18,409) (22,206)
Net income $ 71,868 $ 64,817 $ 149,966 $ 136,226
Net income per Ordinary Share:        
Basic (USD per share) $ 1.33 $ 1.20 $ 2.78 $ 2.52
Diluted (USD per share) $ 1.31 $ 1.19 $ 2.73 $ 2.48
Weighted average number of Ordinary Shares outstanding:        
Basic (in shares) 54,109,702 53,846,544 54,017,631 54,109,800
Diluted (in shares) 54,852,453 54,530,805 54,875,451 54,923,019