Reportable Segments - Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 343,020	$ 338,861	$ 678,228	$ 665,599
Gross profit	97,361	101,026	191,885	194,202
Operating and other expenses	83,353	79,962	165,343	162,348
Income from continuing operations, before income taxes	14,008	21,064	26,542	31,854
Tech
Segment Reporting Information [Line Items]
Revenue	255,750	265,305	522,534	520,948
Gross profit	72,192	74,172	144,646	142,995
FA
Segment Reporting Information [Line Items]
Revenue	87,270	73,556	155,694	144,651
Gross profit	$ 25,169	$ 26,854	$ 47,239	$ 51,207