CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Service revenue, net (includes $2.9 million and $4.6 million with related parties for the three months ended June 30, 2017 and 2016, respectively, and $6.9 million and $12.4 million with related parties for the six months ended June 30, 2017 and 2016)	$ 94,552	$ 92,633	$ 188,333	$ 180,433
Reimbursed out-of-pocket revenue (includes $0.4 million and $1.7 million with related parties for the three months ended June 30, 2017 and 2016, respectively, and $1.1 million and $2.9 million with related parties for the six months ended June 30, 2017 and 2016)	11,664	13,321	24,494	25,107
Total revenue	106,216	105,954	212,827	205,540
Operating expenses:
Direct costs, excluding depreciation and amortization	51,955	49,234	103,060	96,215
Reimbursed out-of-pocket expenses (includes $0.4 million and $1.7 million with related parties for the three months ended June 30, 2017 and 2016, respectively, and $1.1 million and $2.9 million with related parties for the six months ended June 30, 2017 and 2016)	11,664	13,321	24,494	25,107
Selling, general and administrative	14,755	14,824	29,909	28,333
Depreciation	2,101	1,793	4,231	3,566
Amortization	9,462	12,668	18,910	25,336
Total operating expenses	89,937	91,840	180,604	178,557
Income from operations	16,279	14,114	32,223	26,983
Other expense, net:
Miscellaneous expense, net	(125)	(6)	(497)	(941)
Interest expense, net	(1,808)	(5,921)	(3,602)	(11,894)
Total other expense, net	(1,933)	(5,927)	(4,099)	(12,835)
Income before income taxes	14,346	8,187	28,124	14,148
Income tax provision	4,793	3,225	10,124	5,738
Net income	$ 9,553	$ 4,962	$ 18,000	$ 8,410
Net income per share attributable to common shareholders:
Basic	$ 0.24	$ 0.15	$ 0.44	$ 0.26
Diluted	$ 0.23	$ 0.15	$ 0.44	$ 0.26
Weighted average common shares outstanding:
Basic	40,183	32,636	40,425	32,631
Diluted	40,825	32,828	41,158	32,631