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Segment Disclosures - Revenues and Assets by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 443,259 | $ 454,023 | $ 458,928 | $ 492,168 | $ 539,950 | $ 530,555 | $ 538,332 | $ 520,457 | $ 1,848,378 | $ 2,129,294 | $ 1,940,489
Total assets | 14,088,461 |  |  |  | 15,759,265 |  |  |  | 14,088,461 | 15,759,265 | 21,449,849
Assets held for sale and discontinued operations, net | 417,014 |  |  |  | 927,866 |  |  |  | 417,014 | 927,866 | 5,654,326
Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Gross assets | 14,051,070 |  |  |  | 14,692,941 |  |  |  | 14,051,070 | 14,692,941 | 14,801,775
Accumulated depreciation and amortization | (2,919,278) |  |  |  | (2,900,060) |  |  |  | (2,919,278) | (2,900,060) | (2,704,425)
Total assets | 11,131,792 |  |  |  | 11,792,881 |  |  |  | 11,131,792 | 11,792,881 | 12,097,350
Operating segment | Senior housing triple-net |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 313,547 | 423,118 | 428,269
Gross assets | 3,515,400 |  |  |  | 3,871,720 |  |  |  | 3,515,400 | 3,871,720 | 5,092,443
Operating segment | SHOP |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 525,473 | 686,822 | 518,264
Gross assets | 2,392,130 |  |  |  | 3,135,115 |  |  |  | 2,392,130 | 3,135,115 | 2,684,675
Operating segment | Life science |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 358,816 | 358,537 | 342,984
Gross assets | 4,154,372 |  |  |  | 3,961,623 |  |  |  | 4,154,372 | 3,961,623 | 3,613,726
Operating segment | Medical office |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 477,459 | 446,280 | 415,351
Gross assets | 3,989,168 |  |  |  | 3,724,483 |  |  |  | 3,989,168 | 3,724,483 | 3,410,931
Operating segment | Other non-reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 173,083 | 214,537 | 235,621
Total assets | 1,904,433 |  |  |  | 2,255,712 |  |  |  | 1,904,433 | 2,255,712 | 2,392,823
Other non-segment |  |  |  |  |  |  |  |  |  |  |
Segment Disclosure |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 635,222 |  |  |  | $ 782,806 |  |  |  | $ 635,222 | $ 782,806 | $ 1,305,350

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