Condensed 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
Income Statement [Abstract]
Revenues	$ 189,304	$ 315,829	$ 426,143	[1]	$ 585,428	[1]
Operating expenses	131,928	221,232	311,281		424,884
Gross margin	57,376	94,597	114,862		160,544
Selling, general and administrative expenses	58,882	81,593	137,326		163,860
Restructuring and other related charges, net	2,860	0	3,046		208
Goodwill impairment charge	0	0	191,788		0
Operating income (loss)	(4,366)	13,004	(217,298)		(3,524)
Interest expense, net	7,314	7,586	14,090		15,011
Other expense, net	165	313	637		255
Income (Loss) before income taxes	(11,845)	5,105	(232,025)		(18,790)
Less: Provision (benefit) for income taxes	1,683	(997)	(18,770)		(664)
Net income (loss)	$ (13,528)	$ 6,102	$ (213,255)		$ (18,126)
Income (Loss) per common share:
Basic (in dollars per share)	$ (0.44)	$ 0.20	$ (6.97)		$ (0.60)
Diluted (in dollars per share)	$ (0.44)	$ 0.20	$ (6.97)		$ (0.60)
Weighted-average number of shares outstanding:
Basic (in shares)	30,628	30,270	30,584		30,250
Diluted (in shares)	30,628	30,467	30,584		30,250

[1] Revenues attributable to individual countries/geographic areas are based on the country of domicile of the legal entity that performs the work.