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6. PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and equipment, gross $ 774,078 $ 778,429
Accumulated depreciation (529,511) (529,648)
Property and equipment, net 244,567 248,781
Equipment transferred to other assets (266) (1,056)
Property and equipment, net 244,301 247,725
Land [Member]    
Property and equipment, gross 250 250
Medical equipment [Member]    
Property and equipment, gross 380,439 393,001
Computer and office equipment, furniture and fixtures [Member]    
Property and equipment, gross 96,382 99,434
Software development costs [Member]    
Property and equipment, gross 6,391 6,391
Leasehold improvements [Member]    
Property and equipment, gross 273,436 252,595
Equipment under capital lease [Member]    
Property and equipment, gross $ 17,180 $ 26,758