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Debt - Mortgage Payable (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) property derivative loan | Dec. 31, 2016 USD ($) property
Debt Instrument [Line Items] |  |
Number of Interest Rate Derivatives Held | derivative | 7 |
Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Number of mortgage loans | loan | 8 |
Borrowings, amount | $ 93,000,000.0 |
Weighted average interest rate, outstanding | 2.68% |
Number of properties collateralized | property | 47 | 39
Number of notes repaid | loan | 1 |
Repayments of debt | $ 3,500,000 |
Annual principal payment | 1,900,000 |
Interest Rate Swap [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Notional Amount | $ 67,300,000 |
Weighted average interest rate | 1.92% |
Core Portfolio [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Notional Amount | $ 330,381,000 |
Fund II [Member] |  |
Debt Instrument [Line Items] |  |
Derivative, Notional Amount | $ 49,226,000 |
Brandywine Portfolio [Member] | Core Portfolio [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Default Interest | 5.00% |
Brandywine Portfolio [Member] | Core Portfolio [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.99% |
Debt default, amount | $ 26,300,000 | $ 26,300,000
Interest owner percentage in property | 22.00% |
Loss Contingency, Damages Sought, Value | $ 31,000,000 |
Sherman Avenue [Member] | Fund II [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Debt default, amount | $ 14,300,000 |
London Interbank Offered Rate (LIBOR) [Member] | Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.15% |

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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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