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5. PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property and equipment, gross $ 60,025 $ 57,561
Accumulated depreciation and amortization (47,008) (43,809)
Property and equipment, net 13,017 13,752
Medical equipment [Member]    
Property and equipment, gross 40,306 39,841
Office equipment, furniture and fixtures [Member]    
Property and equipment, gross 3,241 3,280
Leasehold improvements [Member]    
Property and equipment, gross 16,257 14,440
Equipment Under Capital Leases [Member]    
Property and equipment, gross $ 221 $ 0