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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 909,212	$ 774,078
Accumulated depreciation	(563,483)	(529,511)
Property and equipment, net	345,729	244,567
Equipment transferred to other assets	0	(266)
Property and equipment, net	345,729	244,301
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	250	250
Medical equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	449,776	380,439
Computer and office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	102,798	96,382
Software development costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,391	6,391
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	337,878	273,436
Equipment under capital lease
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,119	$ 17,180

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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