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Real Estate Properties - Schedule of MOB Acquisitions (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) ft² property | Jan. 31, 2018 USD ($) ft² property | Dec. 31, 2017 USD ($) ft² building property | Nov. 30, 2017 USD ($) ft² property | Oct. 31, 2017 USD ($) ft² property | Jul. 31, 2017 USD ($) ft² property | Jan. 31, 2017 USD ($) ft² property | Oct. 31, 2016 USD ($) ft² property | May 31, 2016 USD ($) ft² property | Feb. 29, 2016 USD ($) ft² property | Dec. 31, 2018 USD ($) ft² building property | Dec. 31, 2017 USD ($) ft² building property | Dec. 31, 2016 USD ($) ft² building property
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Buildings | building |  |  |  |  |  |  |  |  |  |  | 469 |  |
Square Feet | ft² |  |  |  |  |  |  |  |  |  |  | 812 |  |
Real Estate Investment Property, Net |  |  | $ 6,370,286 |  |  |  |  |  |  |  | $ 6,341,908 | $ 6,370,286 |
Acquired Real Estate Leases |  |  | 791,067 |  |  |  |  |  |  |  | 691,219 | 791,067 |
Acquired Real Estate Lease Obligations |  |  | $ (136,713) |  |  |  |  |  |  |  | (134,395) | (136,713) |
Assumed Debt |  |  |  |  |  |  |  |  |  |  | $ (44,386) | $ 0 | $ 0
MOBs |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  |  |  | 13 |  | 2
MOBs | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  |  |  | 4 | 6 | 3
Number of Buildings | building |  |  | 6 |  |  |  |  |  |  |  | 4 | 6 | 5
Square Feet | ft² |  |  | 630 |  |  |  |  |  |  |  | 535 | 630 | 390
Purchase price, including closing costs |  |  |  |  |  |  |  |  |  |  | $ 114,973 | $ 113,168 |
Cash Paid plus Assumed Debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 86,432
Acquired Real Estate Leases |  |  | $ 27,713 |  |  |  |  |  |  |  | 29,527 | 27,713 | 9,645
Acquired Real Estate Lease Obligations |  |  | $ (20) |  |  |  |  |  |  |  | 0 | (20) | (1,091)
Assumed Debt |  |  |  |  |  |  |  |  |  |  | $ (11,050) | $ 0 | $ 0
MOBs | 3 States | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  | 3 |  |  |  |  |  |  |  |  |  |  |
Number of Buildings | building |  |  |  |  |  |  |  |  |  |  | 3 |  |
Square Feet | ft² |  | 400 |  |  |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  | $ 91,698 |  |  |  |  |  |  |  |  |  |  |
Acquired Real Estate Leases |  | 20,220 |  |  |  |  |  |  |  |  |  |  |
Acquired Real Estate Lease Obligations |  | 0 |  |  |  |  |  |  |  |  |  |  |
Assumed Debt |  | 0 |  |  |  |  |  |  |  |  |  |  |
MOBs | Virginia | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
Number of Buildings | building |  |  | 1 |  |  |  |  |  |  |  | 1 | 1 |
Square Feet | ft² | 135 |  | 136 |  |  |  |  |  |  |  |  | 136 |
Purchase price, including closing costs | $ 23,275 |  | $ 15,844 |  |  |  |  |  |  |  |  |  |
Acquired Real Estate Leases | 9,307 |  | 4,986 |  |  |  |  |  |  |  |  | $ 4,986 |
Acquired Real Estate Lease Obligations | 0 |  | (20) |  |  |  |  |  |  |  |  | $ (20) |
Assumed Debt | (11,050) |  | $ 0 |  |  |  |  |  |  |  |  |  |
MOBs | Kansas | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  | 1 |  |  |  |  |  |
Number of Buildings | building |  |  | 1 |  |  |  |  |  |  |  |  | 1 |
Square Feet | ft² |  |  |  |  |  |  | 117 |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  | $ 15,106 |  |  |  |  |  |
Acquired Real Estate Leases |  |  |  |  |  |  | 6,338 |  |  |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  |  |  | 0 |  |  |  |  |  |
Assumed Debt |  |  |  |  |  |  | 0 |  |  |  |  |  |
MOBs | Maryland | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  | 1 |  |  |  |  |  |  |
Number of Buildings | building |  |  | 1 |  |  |  |  |  |  |  |  | 1 |
Square Feet | ft² |  |  |  |  |  | 59 |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  |  | $ 16,601 |  |  |  |  |  |  |
Acquired Real Estate Leases |  |  |  |  |  | 3,937 |  |  |  |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  |  | 0 |  |  |  |  |  |  |
Assumed Debt |  |  |  |  |  | 0 |  |  |  |  |  |  |
MOBs | 2 States | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of Buildings | building |  |  | 2 |  |  |  |  |  |  |  |  | 2 |
Square Feet | ft² |  |  |  |  | 255 |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  |  | $ 38,794 |  |  |  |  |  |  |  |
Acquired Real Estate Leases |  |  |  |  | 7,016 |  |  |  |  |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  | 0 |  |  |  |  |  |  |  |
Assumed Debt |  |  |  |  | 0 |  |  |  |  |  |  |  |
MOBs | California | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of Buildings | building |  |  | 1 |  |  |  |  |  |  |  |  | 1 |
Square Feet | ft² |  |  |  | 63 |  |  |  |  |  |  |  |  |
Purchase price, including closing costs |  |  |  | $ 26,823 |  |  |  |  |  |  |  |  |
Acquired Real Estate Leases |  |  |  | 5,436 |  |  |  |  |  |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  | 0 |  |  |  |  |  |  |  |  |
Assumed Debt |  |  |  | 0 |  |  |  |  |  |  |  |  |
MOBs | Minnesota | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of Buildings | building |  |  |  |  |  |  |  |  |  |  |  |  | 3
Square Feet | ft² |  |  |  |  |  |  |  |  |  | 128 |  |  |
Cash Paid plus Assumed Debt |  |  |  |  |  |  |  |  |  | $ 22,700 |  |  |
Acquired Real Estate Leases |  |  |  |  |  |  |  |  |  | 5,053 |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  |  |  |  |  |  | (1,091) |  |  |
Assumed Debt |  |  |  |  |  |  |  |  |  | 0 |  |  |
MOBs | Florida | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of Buildings | building |  |  |  |  |  |  |  |  |  |  |  |  | 1
Square Feet | ft² |  |  |  |  |  |  |  |  | 166 |  |  |  |
Purchase price, including closing costs |  |  |  |  |  |  |  |  | $ 45,232 |  |  |  |
Acquired Real Estate Leases |  |  |  |  |  |  |  |  | 0 |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  |  |  |  |  | 0 |  |  |  |
Assumed Debt |  |  |  |  |  |  |  |  | 0 |  |  |  |
MOBs | Ohio | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties | property |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of Buildings | building |  |  |  |  |  |  |  |  |  |  |  |  | 1
Square Feet | ft² |  |  |  |  |  |  |  | 96 |  |  |  |  |
Cash Paid plus Assumed Debt |  |  |  |  |  |  |  | $ 18,500 |  |  |  |  |
Acquired Real Estate Leases |  |  |  |  |  |  |  | 4,592 |  |  |  |  |
Acquired Real Estate Lease Obligations |  |  |  |  |  |  |  | 0 |  |  |  |  |
Assumed Debt |  |  |  |  |  |  |  | 0 |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  | $ 824,879 |  |  |  |  |  |  |  | $ 844,567 | $ 824,879 |
Land | MOBs | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  | 25,618 |  |  |  |  |  |  |  | 19,736 | 25,618 | $ 7,845
Land | MOBs | 3 States | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  | 16,873 |  |  |  |  |  |  |  |  |  |  |
Land | MOBs | Virginia | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net | 2,863 |  | 3,263 |  |  |  |  |  |  |  |  | 3,263 |
Land | MOBs | Kansas | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  | 1,522 |  |  |  |  |  |
Land | MOBs | Maryland | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  | 6,138 |  |  |  |  |  |  |
Land | MOBs | 2 States | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  | 6,738 |  |  |  |  |  |  |  |
Land | MOBs | California | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  | 7,957 |  |  |  |  |  |  |  |  |
Land | MOBs | Minnesota | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  |  |  |  | 4,028 |  |  |
Land | MOBs | Florida | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  |  |  | 2,792 |  |  |  |
Land | MOBs | Ohio | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  |  | 1,025 |  |  |  |  |
Buildings and Improvements |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  | 6,999,884 |  |  |  |  |  |  |  | 7,031,733 | 6,999,884 |
Buildings and Improvements | MOBs | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  | 59,857 |  |  |  |  |  |  |  | $ 65,710 | 59,857 | $ 70,033
Buildings and Improvements | MOBs | 3 States | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  | $ 54,605 |  |  |  |  |  |  |  |  |  |  |
Buildings and Improvements | MOBs | Virginia | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net | $ 11,105 |  | $ 7,615 |  |  |  |  |  |  |  |  | $ 7,615 |
Buildings and Improvements | MOBs | Kansas | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  | $ 7,246 |  |  |  |  |  |
Buildings and Improvements | MOBs | Maryland | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  | $ 6,526 |  |  |  |  |  |  |
Buildings and Improvements | MOBs | 2 States | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  | $ 25,040 |  |  |  |  |  |  |  |
Buildings and Improvements | MOBs | California | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  | $ 13,430 |  |  |  |  |  |  |  |  |
Buildings and Improvements | MOBs | Minnesota | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  |  |  |  | $ 14,710 |  |  |
Buildings and Improvements | MOBs | Florida | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  |  |  | $ 42,440 |  |  |  |
Buildings and Improvements | MOBs | Ohio | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net |  |  |  |  |  |  |  | $ 12,883 |  |  |  |  |

X
- Definition This element represents the aggregate purchase price of real estate properties acquired by the entity during the period. This amount includes cash paid plus debt assumed, if any, and other settlement adjustments but excludes closing costs. + References No definition available. + Details
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- Definition The number of buildings owned as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the number of properties acquired or agreed to be acquired by the entity. + References No definition available. + Details
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- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + References No definition available. + Details
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- Definition Represents the intangible lease liabilities recorded as part of the real estate acquisition. + References No definition available. + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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