Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	[1]	$ 236,839	$ 269,599
Operating expenses		179,353	203,652
Gross margin		57,486	65,947
Selling, general and administrative expenses		78,444	82,267
Restructuring and other related charges, net		186	208
Goodwill impairment charge		191,788	0
Operating loss		(212,932)	(16,528)
Interest expense, net		6,776	7,425
Other expense (income), net		472	(58)
Loss before income taxes		(220,180)	(23,895)
Less: Provision (benefit) for income taxes		(20,453)	333
Net loss		$ (199,727)	$ (24,228)
Loss per common share:
Basic (in dollars per share)		$ (6.54)	$ (0.80)
Diluted (in dollars per share)		$ (6.54)	$ (0.80)
Weighted-average number of shares outstanding:
Basic (in shares)		30,540	30,228
Diluted (in shares)		30,540	30,228

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