CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, net (includes $59.6 million, $55.4 million and $34.5 million with related parties for the years ended December 31, 2023, 2022 and 2021, respectively)	$ 1,885,842	$ 1,459,996	$ 1,142,377
Operating expenses:
Direct operating costs	1,361,337	1,027,558	814,222
Selling, general and administrative	161,352	131,400	108,421
Depreciation	24,129	18,989	16,005
Amortization	2,199	3,352	5,114
Total operating expenses	1,549,017	1,181,299	943,762
Income from operations	336,825	278,697	198,615
Other (expense) income, net:
Miscellaneous (expense) income, net	(655)	7,068	3,342
Interest expense, net	(488)	(2,905)	(105)
Total other (expense) income, net	(1,143)	4,163	3,237
Income before income taxes	335,682	282,860	201,852
Income tax provision	52,872	37,492	20,004
Net income	$ 282,810	$ 245,368	$ 181,848
Net income per share attributable to common shareholders:
Earnings per share, basic (in dollars per share)	$ 9.20	$ 7.57	$ 5.06
Earnings per share, diluted (in dollars per share)	$ 8.88	$ 7.28	$ 4.81
Weighted average common shares outstanding:
Weighted average number of shares outstanding, basic (in shares)	30,722	32,388	35,862
Weighted-average shares outstanding, diluted (in shares)	31,841	33,671	37,697
Direct Costs
Operating expenses:
Direct operating costs	$ 638,249	$ 534,887	$ 441,090
Reimbursed out-of-pocket expenses
Operating expenses:
Direct operating costs	$ 723,088	$ 492,671	$ 373,132