Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from services	$ 215,096	$ 209,200	$ 202,757	$ 195,171	$ 200,907	$ 200,717	$ 204,572	$ 210,288	$ 822,224	$ 816,484	$ 865,048
Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									790,654	782,448
Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									31,570	34,036
Nurse and Allied Staffing
Disaggregation of Revenue [Line Items]
Revenue from services									732,815	718,613	756,476
Nurse and Allied Staffing | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									720,393	705,469
Nurse and Allied Staffing | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									12,422	13,144
Physician Staffing
Disaggregation of Revenue [Line Items]
Revenue from services									74,605	82,305	93,610
Physician Staffing | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									70,261	76,979
Physician Staffing | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									4,344	5,326
Search
Disaggregation of Revenue [Line Items]
Revenue from services									14,804	15,566	$ 14,962
Search | Temporary Staffing Services
Disaggregation of Revenue [Line Items]
Revenue from services									0	0
Search | Other Services
Disaggregation of Revenue [Line Items]
Revenue from services									$ 14,804	$ 15,566