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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

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- Definition Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 + Details
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