SEGMENT INFORMATION - Capital Expenditures (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
|
| Segment Reporting Information [Line Items] | ||||
| Capital expenditures | $ 129,589 | $ 78,949 | $ 438,719 | $ 151,057 |
| Operating Segments | Triple-Net Leased Properties | ||||
| Segment Reporting Information [Line Items] | ||||
| Capital expenditures | 48,143 | 15,949 | 141,952 | 56,650 |
| Operating Segments | Senior Living Operations | ||||
| Segment Reporting Information [Line Items] | ||||
| Capital expenditures | 30,056 | 24,808 | 51,381 | 43,802 |
| Operating Segments | Office Operations | ||||
| Segment Reporting Information [Line Items] | ||||
| Capital expenditures | $ 51,390 | $ 38,192 | $ 245,386 | $ 50,605 |