Business Segments (Details 4) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) reporting_unit segment practice_area	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ (6,058)	$ (2,945)	$ (3,132)
Number of Reportable Segments | segment	2
Number of Reporting Units | reporting_unit	4
Number of Practice Areas | practice_area	4
Total assets	$ 448,902	434,738
United States
Segment Reporting Information [Line Items]
Total assets	255,649	248,657
United Kingdom
Segment Reporting Information [Line Items]
Total assets	72,939	72,048
CANADA
Segment Reporting Information [Line Items]
Total assets	43,503	41,974
Other Countries
Segment Reporting Information [Line Items]
Total assets	$ 76,811	72,059
Workforce Excellence [Member]
Segment Reporting Information [Line Items]
Number of Practice Areas | practice_area	2
Total assets	$ 290,465	283,039
Business Transformation Services [Member]
Segment Reporting Information [Line Items]
Number of Practice Areas | practice_area	2
Total assets	$ 158,437	$ 151,699