Reporting Segments Schedule of restructuring and other related cots recognized during the year (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Restructuring and other related costs	$ 0	$ 3,478	$ 240	$ 49	$ 3,604	$ 566	$ 0	$ 47	$ 3,767	$ 4,217	$ 3,645
Operating loss	$ (2,281)	$ (17,921)	$ (6,460)	$ (3,821)	(8,810)	(22,129)	1,203	1,140	(30,483)	(28,596)	5,386
Impairment					$ 0	$ 21,537	$ 0	$ 0	0	21,537	14,653
Impairment									0	21,034
Impairment charge										500
Pretax gain on sale of assets										800
Proceeds from sale of assets									(45)	(1,236)	(75)
Enterprise Talent [Member]
Segment Reporting Information [Line Items]
Restructuring and other related costs									433	1,084	1,001
Operating loss									(7,504)	(1,448)	24,594
Impairment									0	10,654
Specialty Talent and Technology [Member]
Segment Reporting Information [Line Items]
Operating loss									800
Specialty Talent and Technology Solutions [Member]
Segment Reporting Information [Line Items]
Restructuring and other related costs									215	130	152
Operating loss									(483)	731	4,053
Impairment									0	0
Engineering Solutions [Member]
Segment Reporting Information [Line Items]
Restructuring and other related costs									2,690	2,153	2,092
Operating loss									(10,238)	(12,840)	(12,309)
Impairment									0	10,380
Impairment charge										504
MRI [Member]
Segment Reporting Information [Line Items]
Restructuring and other related costs									206	0	259
Operating loss									3,980	6,012	6,531
Corporate [Member]
Segment Reporting Information [Line Items]
Restructuring and other related costs									223	850	141
Operating loss									$ (16,238)	$ (21,051)	$ (17,483)