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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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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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