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Real Estate Properties - Narrative (Details) ft² in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) ft² state living_unit building nursing_facility community property | May 31, 2018 USD ($) community | Mar. 31, 2018 USD ($) ft² building community property | Feb. 28, 2018 living_unit | Feb. 28, 2018 USD ($) | Feb. 28, 2018 community | Feb. 28, 2018 property | Jan. 31, 2018 ft² living_unit | Jan. 31, 2018 ft² building | Jan. 31, 2018 USD ($) ft² | Jan. 31, 2018 ft² community | Jan. 31, 2018 ft² property | Dec. 31, 2017 USD ($) living_unit property | Nov. 30, 2017 property | Jun. 30, 2018 USD ($) ft² state building nursing_facility community property | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) ft² state living_unit building nursing_facility community property | Jun. 30, 2017 USD ($)
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties owned | property | 443 |  |  |  |  |  |  |  |  |  |  |  |  |  | 443 |  | 443 |
Number of buildings owned | building | 469 |  |  |  |  |  |  |  |  |  |  |  |  |  | 469 |  | 469 |
Number of states in which properties are located | state | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  | 42 |  | 42 |
Assumed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,386,000 | $ 0
Impairment of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 548,000 | $ 5,082,000 | 548,000 | 5,082,000
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,762,000 | $ 0 | 261,916,000 | 0
Proceeds from sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 332,389,000 | 0
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,150,000 |  |  |
Impairment of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Acquisition | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Number of Buildings | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Area of real estate properties (in square feet) | ft² | 535 |  |  |  |  |  |  |  |  |  |  |  |  |  | 535 |  | 535 |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,973,000 |
Assumed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,050,000 |
Acquisition | MOBs | Kansas, Missouri And California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of Buildings | building |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  | 400 | 400 | 400 | 400 | 400 |  |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  | $ 91,698,000 |  |  |  |  |  |  |  |
Assumed Debt |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  |  | 544,000 |  |  |  |  |  |  |  |
Acquisition | MOBs | Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Buildings | building |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  | 135 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid plus assumed debt |  |  | $ 23,275,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed Debt |  |  | 11,050,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and certain other transaction related costs |  |  | 525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition | Five Star | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | 2 |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  | 4 |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 66,350,000 |
Assumed Debt | $ 16,588,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,336,000 |
Number of acquired private pay independent living units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 366 |
Purchase price excluding closing costs | 23,860,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and certain other transaction related costs | $ 560,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition | Five Star | Senior Living Communities | Alabama and Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Number of acquired private pay independent living units | living_unit |  |  |  |  |  |  |  |  |  |  |  |  | 229 |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,457,000 |  |  |  |  |
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 307,000 |  |  |  |  |
Acquisition | Five Star | Senior Living Communities | Tennessee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | 2 |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |
Cash paid plus assumed debt | $ 23,860,000 |  |  |  |  |  |  |  |  | 19,868,000 |  |  |  |  |  |  |  |
Assumed Debt | $ 16,588,000 |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Number of acquired private pay independent living units | living_unit | 151 |  |  |  |  |  |  | 88 |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  |  |  |  |  |  | 19,868,000 |  |  |  |  |  |  |  |
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  |  | $ 201,000 |  |  |  |  |  |  |  |
Acquisition | Five Star | Senior Living Communities | Arizona |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  | $ 22,622,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed Debt |  |  |  |  | 16,748,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquired private pay independent living units | living_unit |  |  |  | 127 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs |  |  |  |  | 22,622,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and certain other transaction related costs |  |  |  |  | $ 372,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sunrise Senior Living LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Senior Living Communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  | $ 78,856,000 | $ 181,154,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities sold | community |  | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of properties |  | $ 96,000,000 | $ 217,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 94,348,000 |
Rental income recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 728,000 |  | $ 3,505,000 |
Number of real estate properties held-for-sale | community | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |
Sunrise Senior Living LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Skilled Nursing Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties | $ 1,906,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of properties | 21,865,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental income recognized | $ 650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 331,000 |  | $ 664,000 |
Number of real estate properties held-for-sale | nursing_facility | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |

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