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Segment Disclosures - Revenues and Assets by Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Disclosure                      
Total revenues $ 441,919 $ 456,022 $ 469,551 $ 479,197 $ 443,259 $ 454,023 $ 458,928 $ 492,168 $ 1,846,689 $ 1,848,378 $ 2,129,294
Total assets 12,718,553       14,088,461       12,718,553 14,088,461 15,759,265
Assets held for sale and discontinued operations, net 108,086       417,014       108,086 417,014 927,866
Operating segment                      
Segment Disclosure                      
Gross assets 13,797,386       14,051,070       13,797,386 14,051,070 14,692,941
Accumulated depreciation and amortization (2,915,592)       (2,919,278)       (2,915,592) (2,919,278) (2,900,060)
Total assets 10,881,794       11,131,792       10,881,794 11,131,792 11,792,881
Operating segment | Senior housing triple-net                      
Segment Disclosure                      
Total revenues                 276,091 313,547 423,118
Gross assets 2,965,679       3,515,400       2,965,679 3,515,400 3,871,720
Operating segment | SHOP                      
Segment Disclosure                      
Total revenues                 547,976 525,473 686,822
Gross assets 2,173,795       2,392,130       2,173,795 2,392,130 3,135,115
Operating segment | Life science                      
Segment Disclosure                      
Total revenues                 395,064 358,816 358,537
Gross assets 4,303,471       4,154,372       4,303,471 4,154,372 3,961,623
Operating segment | Medical office                      
Segment Disclosure                      
Total revenues                 509,019 477,459 446,280
Gross assets 4,354,441       3,989,168       4,354,441 3,989,168 3,724,483
Operating segment | Other non-reportable segments                      
Segment Disclosure                      
Total revenues                 118,539 173,083 214,537
Total assets 1,015,854       1,904,433       1,015,854 1,904,433 2,255,712
Other non-segment                      
Segment Disclosure                      
Total assets $ 712,819       $ 635,222       $ 712,819 $ 635,222 $ 782,806