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Debt - Mortgage Payable (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) property derivative loan | Dec. 31, 2016 USD ($) property
Debt Instrument [Line Items] |  |
Number of interest rate derivatives held | derivative | 8 |
Mortgages |  |
Debt Instrument [Line Items] |  |
Number of mortgage loans | loan | 11 |
Borrowings, amount | $ 162,900,000.0 |
Number of properties collateralized | property | 42 | 39
Number of notes repaid | loan | 13 |
Repayments of debt | $ 280,800,000 |
Annual principal payment | 1,000,000 |
Interest Rate Swaps | Mortgages |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 73,300,000 |
Weighted average interest rate | 2.11% |
Core Portfolio |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 397,607,000 |
Brandywine Portfolio | Core Portfolio | Mortgages |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage | 5.99% |
Debt default, amount | $ 26,300,000 | $ 26,300,000
Debt default interest | 5.00% |
Interest owner percentage in property | 22.00% |
Lawsuit damages sought, value | $ 32,100,000 |
LIBOR | Mortgages |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.47% |
Interest rate, stated percentage | 3.90% |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(c)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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