CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUE	$ 5,206,760	$ 4,140,364	$ 3,073,636
COST OF SERVICES	4,216,251	3,398,756	2,510,429
Gross profit	990,509	741,608	563,207
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	574,423	489,344	376,309
GAIN ON SALE OF ASSETS	(2,302)	(1,585)	(1,540)
Operating income	418,388	253,849	188,438
OTHER INCOME (EXPENSE):
Interest income	3,492	46	24
Interest expense	(10,281)	(13,352)	(6,196)
Changes in the fair value of contingent earn-out obligations	(23,607)	(4,819)	7,820
Other	202	134	188
Other income (expense)	(30,194)	(17,991)	1,836
INCOME BEFORE INCOME TAXES	388,194	235,858	190,274
PROVISION (BENEFIT) FOR INCOME TAXES	64,796	(10,089)	46,926
NET INCOME	$ 323,398	$ 245,947	$ 143,348
INCOME PER SHARE:
Basic	$ 9.03	$ 6.84	$ 3.95
Diluted	$ 9.01	$ 6.82	$ 3.93
SHARES USED IN COMPUTING INCOME PER SHARE:
Basic	35,802	35,932	36,285
Diluted	35,895	36,046	36,450