Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues	$ 312,256	$ 336,440	$ 598,810	$ 587,294
Operating expenses	227,613	237,747	439,363	422,619
Gross margin	84,643	98,693	159,447	164,675
Selling, general and administrative expenses	91,065	82,501	180,378	155,863
Exit costs and other related charges (credits) (see Note 16)	271	0	(976)	0
(Gain) loss on revaluation of contingent consideration	0	2,184	(1,174)	2,184
Operating income (loss)	(6,693)	14,008	(18,781)	6,628
Interest expense, net	4,372	3,408	7,530	6,343
Foreign currency (gain) loss and other	17	(166)	358	(138)
Income (loss) from continuing operations before income taxes	(11,082)	10,766	(26,669)	423
Less: Provision (benefit) for income taxes	4	3,796	(6,075)	13
Income (loss) from continuing operations	(11,086)	6,970	(20,594)	410
Income from discontinued operations, net of income tax	0	386	0	512
Net income (loss)	$ (11,086)	$ 7,356	$ (20,594)	$ 922
Basic earnings (loss) per common share:
Continuing operations (in usd per share)	$ (0.37)	$ 0.24	$ (0.69)	$ 0.01
Discontinued operations (in usd per share)	0.00	0.01	0.00	0.02
Net loss (in usd per share)	(0.37)	0.25	(0.69)	0.03
Diluted earnings (loss) per common share:
Continuing operations (in usd per share)	(0.37)	0.24	(0.69)	0.01
Discontinued operations (in usd per share)	0.00	0.01	0.00	0.02
Net loss (in usd per share)	$ (0.37)	$ 0.25	$ (0.69)	$ 0.03