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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Revenue, net (includes $2.7 million and $4.0 million with related parties for the three months ended June 30, 2020 and 2019, respectively, and $8.2 million and $9.1 million with related parties for the six months ended June 30, 2020 and 2019, respectively) $ 204,995 $ 214,104 $ 435,874 $ 414,845
Operating expenses:        
Direct service costs, excluding depreciation and amortization 86,625 79,327 175,420 154,436
Reimbursed out-of-pocket expenses 61,733 70,985 138,739 141,579
Total direct costs 148,358 150,312 314,159 296,015
Selling, general and administrative 21,855 23,556 46,979 44,864
Depreciation 2,674 1,982 5,127 3,973
Amortization 1,980 2,995 3,977 8,839
Total operating expenses 174,867 178,845 370,242 353,691
Income from operations 30,128 35,259 65,632 61,154
Other income (expense), net:        
Miscellaneous income (expense), net 239 (19) 856 (301)
Interest (expense) income, net (5) (748) 352 (1,703)
Total other income (expense), net 234 (767) 1,208 (2,004)
Income before income taxes 30,362 34,492 66,840 59,150
Income tax provision 6,258 7,037 13,782 12,497
Net income $ 24,104 $ 27,455 $ 53,058 $ 46,653
Net income per share attributable to common shareholders:        
Basic $ 0.68 $ 0.76 $ 1.48 $ 1.30
Diluted $ 0.64 $ 0.73 $ 1.40 $ 1.24
Weighted average common shares outstanding:        
Basic 35,386 35,839 35,705 35,772
Diluted 37,328 37,389 37,680 37,377