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Fair Value of Assets and Liabilities - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) ft² property debt_security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) property
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of assets | $ 66,346 | $ 5,082 | $ 18,674
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of debt securities | debt_security | 2 |  |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of debt securities | debt_security | 5 |  |
Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale | $ 1,928 |  |
Aggregate fair value of assets | 11,167 |  |
Fair Value, Measurements, Nonrecurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale | 0 |  |
Aggregate fair value of assets | 0 |  |
Fair Value, Measurements, Nonrecurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale | 1,928 |  |
Aggregate fair value of assets | $ 0 |  |
MOBs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of properties acquired or agreed to be acquired | property | 13 |  | 2
Impairment of assets | $ 46,797 |  | $ 11,488
MOBs | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of properties acquired or agreed to be acquired | property | 11 |  |
Impairment of assets | $ 44,069 |  |
Aggregate fair value of assets | $ 11,167 |  |
MOBs | Massachusetts | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of properties acquired or agreed to be acquired | property | 13 |  |
Discontinued Operations, Held-for-sale | MOBs | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of properties acquired or agreed to be acquired | property | 2 |  |
Impairment of assets | $ 2,728 |  |
Real estate held for sale | $ 1,928 |  |
Discontinued Operations, Held-for-sale | MOBs | Massachusetts | Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of properties acquired or agreed to be acquired | property | 2 |  |
Real Estate Properties | Measurement Input, Estimated Market Rents | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | ft² | 12.00 |  |
Real Estate Properties | Measurement Input, Estimated Market Rents | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | ft² | 16.00 |  |
Real Estate Properties | Measurement Input, Estimated Market Rents | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | ft² | 14.00 |  |
Real Estate Properties | Measurement Input, Leasing And Capital Improvements |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | ft² | 40.00 |  |
Absorption time | 18 months |  |
Real Estate Properties | Measurement Input, Cap Rate | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.09 |  |
Real Estate Properties | Measurement Input, Cap Rate | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.10 |  |
Real Estate Properties | Measurement Input, Cap Rate | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.08 |  |
Real Estate Properties | Measurement Input, Discount Rate | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.10 |  |
Real Estate Properties | Measurement Input, Discount Rate | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.11 |  |
Real Estate Properties | Measurement Input, Discount Rate | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Measurement input | 0.09 |  |

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