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Noncontrolling Interest (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) building property | Mar. 31, 2018 USD ($)
Noncontrolling Interest [Line Items] |  |
Comprehensive income attributable to noncontrolling interest | $ (1,422) | $ (1,383)
Cash distribution for joint venture partners | 5,503 | $ 5,667
Variable interest entity, consolidated, carrying amount, real estate assets | 740,105 |
Variable interest entity, consolidated, carrying amount, mortgage debt | $ 620,000 |
Joint Venture |  |
Noncontrolling Interest [Line Items] |  |
Ownership percentage by noncontrolling owners | 45.00% |
Ownership percentage | 55.00% |
Massachusetts | MOBs | Joint Venture |  |
Noncontrolling Interest [Line Items] |  |
Number of properties included in joint venture agreement | property | 1 |
Number of buildings included in joint venture agreement | building | 2 |

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4613674-111683 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 + Details
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