CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUE	$ 743,468	$ 650,302	$ 1,443,599	$ 1,188,775
COST OF SERVICES	597,773	530,286	1,180,811	962,094
Gross profit	145,695	120,016	262,788	226,681
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	85,045	84,506	177,969	163,411
GAIN ON SALE OF ASSETS	(312)	(192)	(866)	(411)
Operating income	60,962	35,702	85,685	63,681
OTHER INCOME (EXPENSE):
Interest income	28	67	92	92
Interest expense	(2,554)	(3,050)	(5,171)	(4,112)
Changes in the fair value of contingent earn-out obligations	(3,871)	(1,762)	(1,599)	(1,920)
Other		149	25	164
Other income (expense)	(6,397)	(4,596)	(6,653)	(5,776)
INCOME BEFORE INCOME TAXES	54,565	31,106	79,032	57,905
PROVISION FOR INCOME TAXES	15,070	6,933	21,821	13,866
NET INCOME	$ 39,495	$ 24,173	$ 57,211	$ 44,039
INCOME PER SHARE:
Basic (in shares)	$ 1.08	$ 0.65	$ 1.56	$ 1.19
Diluted (in shares)	$ 1.08	$ 0.65	$ 1.55	$ 1.18
SHARES USED IN COMPUTING INCOME PER SHARE:
Basic (in shares)	36,581	36,943	36,628	36,933
Diluted (in shares)	36,737	37,223	36,821	37,228
DIVIDENDS PER SHARE (in dollars per share)	$ 0.105	$ 0.100	$ 0.210	$ 0.195