ACQUISITIONS (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($) state item clinic	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
Acquisitions
Number of businesses acquired | item		0	0
Components of the aggregated purchase price the assets acquired and liabilities assumed
Issuance of seller notes				$ 4,662
Goodwill		$ 196,343	$ 249,678	335,642	$ 249,678	$ 249,678	$ 249,678	$ 335,642	$ 335,642	$ 335,642
O & P and Distribution companies
Acquisitions
Amount of goodwill deductible for tax purposes				8,200
Components of the aggregated purchase price the assets acquired and liabilities assumed
Net cash				10,215
Issuance of seller notes				4,662
Other working capital adjustments				376
Aggregate purchase price				15,253
Net accounts receivable				1,045
Inventories				481
Intangible assets, excluding goodwill				5,455
Other assets				112
Liabilities assumed				(15)
Net assets acquired				7,078
Goodwill				$ 8,175
O & P company
Acquisitions
Number of businesses acquired | item	3
Number of patient care clinics operated by acquiree | clinic	15
Number of states where the acquired entities operate | state	3
Working capital adjustments and contingent consideration	$ 400
Components of the aggregated purchase price the assets acquired and liabilities assumed
Consideration paid in cash	10,200
Issuance of seller notes	4,700
Aggregate purchase price	$ 15,300