ACQUISITIONS - Advantage RN (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended		15 Months Ended
	Jul. 28, 2017	Jul. 01, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Business Acquisition [Line Items]
Cash consideration				$ 0	$ 85,977
Proceeds from Term Loans				0	$ 62,000
Advantage RN, LLC [Member]
Business Acquisition [Line Items]
Cash consideration		$ 86,600
Net working capital adjustment		600
Reimbursement from working capital adjustment settled			$ 800
Contingent liability				$ 100		$ 100
Release of remaining contingent liability						$ 500
Escrow payment related to tax liabilities		14,500
Escrow payment related to post-close liabilities		7,500
Release of escrow to seller	$ 7,300
Escrow deposit related to tax liabilities	$ 7,200
Consideration transferred, available cash		19,900
Deferred Consideration Transferred [Member] | Advantage RN, LLC [Member]
Business Acquisition [Line Items]
Contingent liability		$ 600
Period of deferred consideration		20 months
Credit Agreement [Member]
Business Acquisition [Line Items]
Proceeds from Term Loans		$ 66,900
Term Loan [Member] | Incremental Term Loan [Member]
Business Acquisition [Line Items]
Proceeds from Term Loans		40,000
Purchase Price [Member] | Advantage RN, LLC [Member]
Business Acquisition [Line Items]
Purchase price		$ 88,000