ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands				6 Months Ended		21 Months Ended
	May 03, 2017	Oct. 30, 2015	Jun. 30, 2014	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 01, 2016
Business Acquisition [Line Items]
Cash purchase price paid at closing				$ 0	$ 1,858
Release of remaining contingent liability				(551)	$ (470)
Mediscan [Member]
Business Acquisition [Line Items]
Cash purchase price paid at closing		$ 29,900
Cash consideration plus working capital estimate		28,000
Fair value of shares		$ 4,700
Fair value of shares (in shares)		349,871
Release of escrow to seller	$ 5,000
Contingent consideration, range of outcomes, high		$ 7,000
Contingent consideration liabilities				4,600
Medical Staffing Network [Member]
Business Acquisition [Line Items]
Contingent consideration liabilities			$ 2,500							$ 2,100
Period of deferred consideration			21 months
Release of remaining contingent liability						$ 400
Potential Earnout, Attainment of Specific Performance Criteria in 2016 [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high		3,500
Potential Earnout, Attainment of Specific Performance Criteria in 2017 [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high		$ 3,500
Potential Earnout [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration liabilities				800
Assumed Additional Contingent Purchase Price Liabilities [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high									$ 300
Contingent consideration liabilities				3,800
Contingent liability paid				$ 100
Forecast [Member] | Assumed Additional Contingent Purchase Price Liabilities [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high							$ 300	$ 300