CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue, net (includes $5.3 million and $5.5 million with related parties for the three months ended March 31, 2021 and 2020, respectively)	$ 259,965	$ 230,879
Operating expenses:
Total direct costs	181,538	165,801
Selling, general and administrative	25,738	25,124
Depreciation	3,812	2,453
Amortization	1,278	1,997
Total operating expenses	212,366	195,375
Income from operations	47,599	35,504
Other income, net:
Miscellaneous income, net	924	617
Interest (expense) income, net	(14)	357
Total other income, net	910	974
Income before income taxes	48,509	36,478
Income tax provision	5,203	7,524
Net income	$ 43,306	$ 28,954
Net income per share attributable to common shareholders:
Basic	$ 1.21	$ 0.80
Diluted	$ 1.14	$ 0.76
Weighted average common shares outstanding:
Basic	35,753	36,024
Diluted	37,749	38,030
Direct Costs
Operating expenses:
Total direct costs	$ 101,387	$ 88,795
Reimbursable Out of Pocket Costs
Operating expenses:
Total direct costs	$ 80,151	$ 77,006