ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended		21 Months Ended
	May 03, 2017	Jun. 30, 2014	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 01, 2016	Apr. 01, 2016	Oct. 30, 2015
Business Acquisition [Line Items]
Consolidated net income			$ 7,044	$ 14,289		$ 10,546	$ 16,380
US Resources Healthcare, LLC [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high												$ 4,500
Mediscan [Member]
Business Acquisition [Line Items]
Net working capital adjustment					$ 300
Release of escrow to seller	$ 5,000
Contingent consideration, range of outcomes, high														$ 7,000
Medical Staffing Network [Member]
Business Acquisition [Line Items]
Contingent consideration liabilities													$ 2,100
Release of remaining contingent liability								$ 400
Potential Earnout, Attainment of Specific Performance Criteria in 2017 [Member] | US Resources Healthcare, LLC [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high												1,000
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, Attainment of Specific Performance Criteria in 2018 [Member] | US Resources Healthcare, LLC [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high												2,000
Potential Earnout, Attainment of Specific Performance Criteria in 2019 [Member] | US Resources Healthcare, LLC [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high												$ 1,500
Potential Earnout, Attainment of Specific Performance Criteria in 2016 [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high														$ 3,500
Assumed Additional Contingent Purchase Price Liabilities [Member] | US Resources Healthcare, LLC [Member]
Business Acquisition [Line Items]
Contingent consideration liabilities			1,500			1,500
Assumed Additional Contingent Purchase Price Liabilities [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high											$ 300
Contingent liability paid						300
Contingent consideration liabilities			$ 3,800			3,800
Deferred Consideration Transferred [Member] | Medical Staffing Network [Member]
Business Acquisition [Line Items]
Contingent consideration liabilities		$ 2,500
Period of deferred consideration		21 months
Forecast [Member] | Assumed Additional Contingent Purchase Price Liabilities [Member] | Mediscan [Member]
Business Acquisition [Line Items]
Contingent consideration, range of outcomes, high									$ 300	$ 300
Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Consolidated net income						$ 2,000