CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue, net (includes $9.9 million and $2.7 million with related parties for the three months ended June 30, 2021 and 2020, respectively, and $15.2 million and $8.2 million with related parties for the six months ended June 30, 2021 and 2020, respectively)	$ 278,293	$ 204,995	$ 538,258	$ 435,874
Operating expenses:
Total direct costs	203,642	148,358	385,180	314,159
Selling, general and administrative	26,973	21,855	52,711	46,979
Depreciation	3,951	2,674	7,763	5,127
Amortization	1,279	1,980	2,557	3,977
Total operating expenses	235,845	174,867	448,211	370,242
Income from operations	42,448	30,128	90,047	65,632
Other income, net:
Miscellaneous income, net	265	239	1,189	856
Interest (expense) income, net	(27)	(5)	(41)	352
Total other income, net	238	234	1,148	1,208
Income before income taxes	42,686	30,362	91,195	66,840
Income tax provision	2,752	6,258	7,955	13,782
Net income	$ 39,934	$ 24,104	$ 83,240	$ 53,058
Net income per share attributable to common shareholders:
Basic	$ 1.11	$ 0.68	$ 2.32	$ 1.48
Diluted	$ 1.06	$ 0.64	$ 2.20	$ 1.40
Weighted average common shares outstanding:
Basic	35,894	35,386	35,825	35,705
Diluted	37,714	37,328	37,737	37,680
Direct Costs
Operating expenses:
Total direct costs	$ 108,233	$ 86,625	$ 209,620	$ 175,420
Reimbursable Out of Pocket Costs
Operating expenses:
Total direct costs	$ 95,409	$ 61,733	$ 175,560	$ 138,739