CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUE	$ 713,895	$ 743,468	$ 1,383,656	$ 1,443,599
COST OF SERVICES	587,440	597,773	1,133,732	1,180,811
Gross profit	126,455	145,695	249,924	262,788
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	87,549	85,045	175,763	177,969
GAIN ON SALE OF ASSETS	(491)	(312)	(841)	(866)
Operating income	39,397	60,962	75,002	85,685
OTHER INCOME (EXPENSE):
Interest income	3	28	6	92
Interest expense	(1,360)	(2,554)	(2,857)	(5,171)
Changes in the fair value of contingent earn-out obligations	4,581	(3,871)	5,767	(1,599)
Other	161		92	25
Other income (expense)	3,385	(6,397)	3,008	(6,653)
INCOME BEFORE INCOME TAXES	42,782	54,565	78,010	79,032
PROVISION FOR INCOME TAXES	9,817	15,070	18,554	21,821
NET INCOME	$ 32,965	$ 39,495	$ 59,456	$ 57,211
INCOME PER SHARE:
Basic	$ 0.91	$ 1.08	$ 1.64	$ 1.56
Diluted	$ 0.90	$ 1.08	$ 1.63	$ 1.55
SHARES USED IN COMPUTING INCOME PER SHARE:
Basic	36,403	36,581	36,345	36,628
Diluted	36,566	36,737	36,533	36,821
DIVIDENDS PER SHARE	$ 0.115	$ 0.105	$ 0.230	$ 0.210