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Real Estate Investments - Summary of Office Properties Sold (Parenthetical) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) ft² | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² Installment | Sep. 30, 2016 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from the sale of properties |  |  |  |  | $ 114,821 | $ 758,931
Assets held for sale, net | $ 31,125 |  | $ 41,718 |  | 31,125 |
Net gain (loss) on disposition of real estate | $ 0 |  |  | $ (104) | $ 8,411 | $ 114,625
Two, Four A, Four B and Five Eves Drive (Evesham Corporate Center) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  | $ 1,000 |  |  |  |
200, 210 & 220 Lake Drive East (Woodland Falls) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  | 7,300 |  |  |
Philadelphia Marine Center (Marine Piers) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Rentable Square Feet | ft² | 181,900 |  |  |  | 181,900 |
Aggregate sales price | $ 21,400 |  |  |  | $ 21,400 |
Number of installments | Installment |  |  |  |  | 2 |
First installment payment |  |  |  |  | $ 12,000 |
Second installment payment | 9,400 |  |  |  | $ 9,400 |
Date of second installment payment |  |  |  |  | Jan. 31, 2020 |
Proceeds from the sale of properties |  |  |  |  | $ 11,200 |
Assets held for sale, net |  | 4,700 |  |  |  |
Net gain (loss) on disposition of real estate |  |  |  |  | 6,500 |
Deferred gain on sale | $ 9,400 |  |  |  | 9,400 |
11700, 11710, 11720 & 11740 Beltsville Drive (Calverton) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  | 1,700 | 3,000 |  |  |
Purchase price reduction |  | $ 1,700 |  |  |  |
1200 & 1220 Concord Avenue (Concord Airport Plaza) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  | $ 11,500 |  |  |
Proceeds after closing costs and prorations |  |  |  |  | $ 32,000 |

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