CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUE	$ 480,851	$ 428,760	$ 1,326,850	$ 1,242,240
COST OF SERVICES	379,993	335,944	1,054,300	986,496
Gross profit	100,858	92,816	272,550	255,744
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	66,707	61,032	196,553	180,245
GOODWILL IMPAIRMENT			1,105
GAIN ON SALE OF ASSETS	(184)	(166)	(464)	(523)
Operating income	34,335	31,950	75,356	76,022
OTHER INCOME (EXPENSE):
Interest income	16	3	55	6
Interest expense	(961)	(563)	(2,392)	(1,870)
Changes in the fair value of contingent earn-out obligations	2,469	804	1,845	468
Other	10	80	57	455
Other income (expense)	1,534	324	(435)	(941)
INCOME BEFORE INCOME TAXES	35,869	32,274	74,921	75,081
INCOME TAX EXPENSE	13,585	11,803	27,188	27,052
NET INCOME	$ 22,284	$ 20,471	$ 47,733	$ 48,029
Basic-
Net income (in dollars per share)	$ 0.60	$ 0.55	$ 1.28	$ 1.28
Diluted-
Net income (in dollars per share)	$ 0.59	$ 0.54	$ 1.27	$ 1.27
SHARES USED IN COMPUTING INCOME PER SHARE:
Basic (in shares)	37,232	37,360	37,259	37,380
Diluted (in shares)	37,626	37,821	37,684	37,854
DIVIDENDS PER SHARE (in dollars per share)	$ 0.075	$ 0.070	$ 0.220	$ 0.205