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DISCONTINUED OPERATIONS - Effect on Net Income and Gains (Losses) From Sale Of Property (Details) $ in Thousands | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Oct. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) | Apr. 30, 2018 USD ($) property | Apr. 30, 2017 USD ($) property | Apr. 30, 2016 USD ($) property
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rentals |  |  |  |  |  |  |  |  |  |  |  | $ 117,575 |  |  |  |
Revenues | $ 30,287 | $ 45,638 | $ 45,946 | $ 44,185 | $ 42,716 | $ 41,866 | $ 40,978 | $ 42,811 | $ 39,797 | $ 39,195 | $ 38,301 | 121,871 | $ 111,249 | $ 169,745 | $ 160,104 | $ 145,500
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses, excluding real estate taxes |  |  |  |  |  |  |  |  |  |  |  | 37,198 | 35,581 | 54,292 | 47,587 | 43,741
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  | 13,521 | 12,234 | 18,742 | 16,739 | 14,407
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 50,456 | 54,902 | 82,070 | 44,253 | 39,273
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  | 1,221 |  | 18,065 | 57,028 | 5,543
TOTAL EXPENSES |  |  |  |  |  |  |  |  |  |  |  | 116,786 | 116,266 | 193,449 | 190,214 | 121,244
Interest expense |  |  |  |  |  |  |  |  |  |  |  | (21,359) | (22,804) | (34,178) | (34,314) | (28,417)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | (556) | (818) | (940) | (1,651) | (106)
Interest income |  |  |  |  |  |  |  |  |  |  |  | 1,168 | 432 | 1,197 | 366 | 78
Other income |  |  |  |  |  |  |  |  |  |  |  | 65 | 282 | 311 | 780 | 307
Gain (loss) on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 10,277 |  | 183,687 | 74,847 | 33,423
INCOME FROM DISCONTINUED OPERATIONS |  |  |  |  |  |  |  |  |  |  |  | 570 | 150,703 | 164,823 | 76,753 | 67,420
Property Sale Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  | $ 10,277 |  | $ 183,687 | $ 74,847 | 33,423
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 27 | 0 |
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 163,567 | $ 56,146 | 23,782
Default interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,700
Non-recourse loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,600
Gain on extinguishment of debt from transfer of ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,500
Number of loan properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9
Property Sale Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 437,652 | 239,436 | $ 373,460
Net book value and sales costs |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (274,085) | (183,290) | (349,678)
Gain (loss) on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 163,567 | 56,146 | 23,782
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate rentals |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 19,744 | 43,984 | 69,623
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property operating expenses, excluding real estate taxes |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 6,350 | 9,051 | 17,470
Real estate taxes |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 5,191 | 6,848 | 11,611
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 8,445 | 10,772 | 24,725
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 | 440
TRS senior housing expenses |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 3,113 | 3,366
TOTAL EXPENSES |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 20,192 | 30,358 | 59,569
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 11,202 | 32,954 | 37,443
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (4,172) | (11,628) | (25,757)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (6,508) | (3,238) | 29,336
Interest income |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 661 | 2,179 | 2,179
Other income |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 73 | 340 | 437
Income (loss) from discontinued operations before gain on sale |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 1,256 | 20,607 | 43,638
Gain (loss) on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 570 |  | 163,567 | 56,146 | 23,782
INCOME FROM DISCONTINUED OPERATIONS |  |  |  |  |  |  |  |  |  |  |  | 570 |  | 164,823 | 76,753 | 67,420
Property Sale Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of discontinued operations |  |  |  |  |  |  |  |  |  |  |  | 570 |  | 163,567 | $ 56,146 | $ 23,782
Discontinued Operations, Disposed of by Sale | Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48
Discontinued Operations, Disposed of by Sale | Retail Site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17
Discontinued Operations, Disposed of by Sale | Commercial Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Discontinued Operations, Disposed of by Sale | Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties disposed | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 |
Discontinued Operations, Disposed of by Sale | All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS |  |  |  |  |  |  |  |  |  |  |  | 570 |  | 164,823 | $ 76,753 | $ 67,420
Discontinued Operations, Held-for-sale | Senior Housing Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34
Tenant Reimbursement | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 11,650 | 16,110 | $ 23,434
TRS Senior Housing | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 3,218 | 3,955
Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 50,719 |  | 73,034 | 64,326 | 58,148
Real Estate | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 31,394 | 63,312 | 97,012
Management Service |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | 3,663 | $ 3,652 | 5,526 | 5,046 | 3,714
Management Service | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EXPENSES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management expense |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 206 | $ 574 | $ 1,957

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