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Real Estate Properties - MOB Acquisitions Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 12, 2017 USD ($) ft² building | Jan. 17, 2017 USD ($) ft² building property | Jan. 31, 2018 USD ($) ft² living_unit building | Dec. 31, 2017 USD ($) ft² building property | Nov. 30, 2017 USD ($) ft² building property | Oct. 31, 2017 USD ($) ft² building property | Oct. 31, 2016 USD ($) ft² building property | May 31, 2016 USD ($) ft² building property | Feb. 29, 2016 USD ($) ft² building property | Jan. 31, 2015 USD ($) ft² living_unit building | Dec. 31, 2017 USD ($) ft² property | Dec. 31, 2016 USD ($) ft² property | Dec. 31, 2015 USD ($) ft² property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 181,433
Minnesota | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  |  | 3 |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  | 128,000 |  |  |  |
Acquired lease amortization period |  |  |  |  |  |  |  |  | 6 years 4 months 24 days |  |  |  |
Below market, acquired lease amortization period |  |  |  |  |  |  |  |  | 7 years 3 months 18 days |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  |  |  |  | $ 22,700 |  |  |  |
Florida | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  |  | 1 |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  | 166,000 |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  | $ 45,000 |  |  |  |  |
Ohio | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  |  | 1 |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  | 96,000 |  |  |  |  |  |
Acquired lease amortization period |  |  |  |  |  |  | 14 years 1 month 6 days |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  |  | $ 18,500 |  |  |  |  |  |
Acquisitions | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  | 23 | 6 | 3 | 23
Number of buildings acquired | building |  |  |  |  |  |  |  |  |  | 23 |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 630,000 |  |  |  |  |  | 2,170,000 | 630,000 | 390,000 | 2,170,000
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  |  |  |  |  | $ 539,000 |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  | $ 113,168 | $ 86,432 | $ 531,623
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  | $ 29,955 | $ 0 | $ 0 | $ 29,955
Weighted average interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  | 4.73% |  |  |
Net closing adjustments |  |  |  |  |  |  |  |  |  | $ 7,377 |  |  |
Acquisitions | MOBs | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Below market, acquired lease amortization period |  |  |  |  |  |  |  |  |  | 11 years 2 months 12 days |  |  |
Acquisitions | Kansas | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  | 1 |  |  |  |  |  |  |  |  | 1 |  |
Number of buildings acquired | building |  | 1 |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  | 117,000 |  | 117,000 |  |  |  |  |  |  | 117,000 |  |
Purchase price, including closing costs |  | $ 15,106 |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  | $ 35 |  |  |  |  |  |  |  |  |  |  |
Acquired lease amortization period |  | 10 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  | $ 15,106 |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Acquisitions | Maryland | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  | 1 |  |  |  |  |  | 1 |  |
Number of buildings acquired | building | 1 |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² | 59,000 |  |  | 59,000 |  |  |  |  |  |  | 59,000 |  |
Purchase price, including closing costs | $ 16,601 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs incurred | $ 383 |  |  |  |  |  |  |  |  |  |  |  |
Acquired lease amortization period | 3 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  | $ 16,601 |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Acquisitions | Minnesota and North Carolina | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of buildings acquired | building |  |  |  |  |  | 2 |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  | 255,000 |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  | $ 38,794 |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  |  | $ 283 |  |  |  |  |  |  |
Acquired lease amortization period |  |  |  |  |  | 2 years 7 months 6 days |  |  |  |  |  |  |
Acquisitions | California | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  | 1 |  |  |  |  |  | 1 |  |
Number of buildings acquired | building |  |  |  |  | 1 |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 63,000 | 63,000 |  |  |  |  |  | 63,000 |  |
Purchase price, including closing costs |  |  |  |  | $ 26,823 |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  |  | $ 323 |  |  |  |  |  |  |  |
Acquired lease amortization period |  |  |  |  | 8 years 8 months 18 days |  |  |  |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  | $ 26,823 |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Acquisitions | Virginia | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  | 1 |  |  |  |  |  |  | 1 |  |
Number of buildings acquired | building |  |  |  | 1 |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  | 136,000 |  |  |  |  |  |  | 136,000 |  |
Purchase price, including closing costs |  |  |  | $ 15,844 |  |  |  |  |  |  |  |  |
Acquisition costs incurred |  |  |  | $ 275 |  |  |  |  |  |  |  |  |
Below market, acquired lease amortization period |  |  |  | 6 years 9 months 18 days |  |  |  |  |  |  |  |  |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  | $ 15,844 |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Acquisitions | Minnesota | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  | 1 |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  | 128,000 |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  |  | $ 22,700 |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Acquisitions | Florida | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  | 1 |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  | 166,000 |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  |  | $ 45,232 |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Acquisitions | Ohio | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  | 1 |
Area of real estate properties (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  | 96,000 |
Cash paid plus assumed debt |  |  |  |  |  |  |  |  |  |  |  | $ 18,500 |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Above market leases | Acquisitions | MOBs | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired lease amortization period |  |  |  |  |  |  |  |  |  | 9 years 6 months |  |  |
Above market leases | Acquisitions | Virginia | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired lease amortization period |  |  |  | 6 years 1 month 6 days |  |  |  |  |  |  |  |  |
Original value lease | Acquisitions | MOBs | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired lease amortization period |  |  |  |  |  |  |  |  |  | 9 years 8 months 12 days |  |  |
Original value lease | Acquisitions | Virginia | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired lease amortization period |  |  |  | 7 years 2 months 12 days |  |  |  |  |  |  |  |  |
Subsequent Event | Acquisitions | Kansas, Missouri and California | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | living_unit |  |  | 3 |  |  |  |  |  |  |  |  |  |
Number of buildings acquired | building |  |  | 3 |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  | $ 91,154 |  |  |  |  |  |  |  |  |  |

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