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Real Estate Investments - Summary of Office Properties Sold (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 15, 2017 USD ($) ft² | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) ft² property | Dec. 31, 2017 USD ($) ft² property | Dec. 31, 2016 USD ($) ft² property
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  | 10 |  |
Rentable Square Feet | ft² |  |  |  | 1,414,457 |  |
Sales Price |  |  |  | $ 359,300 |  |
Proceeds from the sale of properties |  |  |  | 324,090 | $ 171,860 | $ 784,331
Gain/(Loss) on Sale |  |  |  | $ 2,932 | $ 31,657 | $ 116,983
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 |
Sales Price |  | $ 21,400 |  |  | $ 21,400 |
Proceeds from the sale of properties |  | 11,200 |  |  | 11,200 |
Gain/(Loss) on Sale |  | $ 6,500 |  |  | $ 6,500 |
2970 Market Street (Cira Square) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain/(Loss) on Sale |  |  | $ 500 |  |  |
Office Properties [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 66
Rentable Square Feet | ft² |  |  |  |  |  | 5,239,632
Sales Price |  |  |  |  |  | $ 820,000
Proceeds from the sale of properties |  |  |  |  |  | 769,799
Gain/(Loss) on Sale | [1] |  |  |  |  | $ 116,983
Office Properties [Member] | 11, 14, 15, 17 and 18 Campus Boulevard (Newtown Square) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 5 |
Rentable Square Feet | ft² |  |  |  |  | 252,802 |
Sales Price |  |  |  |  | $ 42,000 |
Proceeds from the sale of properties |  |  |  |  | 40,459 |
Gain/(Loss) on Sale | [1] |  |  |  | $ 19,642 |
Office Properties [Member] | 630 Allendale Road [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 1 |
Rentable Square Feet | ft² |  |  |  |  | 150,000 |
Sales Price |  |  |  |  | $ 17,500 |
Proceeds from the sale of properties |  |  |  |  | 16,580 |
Gain/(Loss) on Sale | [1] |  |  |  | $ 3,605 |
Office Properties [Member] | 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] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 4 |
Rentable Square Feet | ft² |  |  |  |  | 134,794 |
Sales Price |  |  |  |  | $ 9,700 |
Proceeds from the sale of properties |  |  |  |  | 8,650 |
Gain/(Loss) on Sale | [1],[2] |  |  |  | $ (325) |
Office Properties [Member] | 200, 210 & 220 Lake Drive East (Woodland Falls) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 3 |
Rentable Square Feet | ft² |  |  |  |  | 215,465 |
Sales Price |  |  |  |  | $ 19,000 |
Proceeds from the sale of properties |  |  |  |  | 17,771 |
Gain/(Loss) on Sale | [1],[3] |  |  |  | $ (249) |
Office Properties [Member] | 11700, 11710, 11720 & 11740 Beltsville Drive (Calverton) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 3 |
Rentable Square Feet | ft² |  |  |  |  | 313,810 |
Sales Price |  |  |  |  | $ 9,000 |
Proceeds from the sale of properties |  |  |  |  | 8,354 |
Gain/(Loss) on Sale | [1],[4] |  |  |  | $ 0 |
Office Properties [Member] | 1200 & 1220 Concord Avenue (Concord Airport Plaza) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 2 |
Rentable Square Feet | ft² |  |  |  |  | 350,256 |
Sales Price |  |  |  |  | $ 33,100 |
Proceeds from the sale of properties |  |  |  |  | 32,010 |
Gain/(Loss) on Sale | [1] |  |  |  | $ 551 |
Office Properties [Member] | 620, 640, 660 Allendale Road [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 3
Rentable Square Feet | ft² |  |  |  |  |  | 156,669
Sales Price |  |  |  |  |  | $ 12,800
Proceeds from the sale of properties |  |  |  |  |  | 12,014
Gain/(Loss) on Sale | [1] |  |  |  |  | $ 2,382
Office Properties [Member] | 1120 Executive Plaza [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 1
Rentable Square Feet | ft² |  |  |  |  |  | 95,183
Sales Price |  |  |  |  |  | $ 9,500
Proceeds from the sale of properties |  |  |  |  |  | 9,241
Gain/(Loss) on Sale | [1],[5] |  |  |  |  | $ (18)
Office Properties [Member] | 50 East Clementon Road [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 1
Rentable Square Feet | ft² |  |  |  |  |  | 3,080
Sales Price |  |  |  |  |  | $ 1,100
Proceeds from the sale of properties |  |  |  |  |  | 1,011
Gain/(Loss) on Sale | [1] |  |  |  |  | $ (85)
Office Properties [Member] | 196/198 Van Buren Street (Herndon Metro Plaza I&II) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 2
Rentable Square Feet | ft² |  |  |  |  |  | 197,225
Sales Price |  |  |  |  |  | $ 44,500
Proceeds from the sale of properties |  |  |  |  |  | 43,412
Gain/(Loss) on Sale | [1],[6] |  |  |  |  | $ (752)
Office Properties [Member] | 2970 Market Street (Cira Square) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 1
Rentable Square Feet | ft² |  |  |  |  |  | 862,692
Sales Price |  |  |  |  |  | $ 354,000
Proceeds from the sale of properties |  |  |  |  |  | 350,150
Gain/(Loss) on Sale | [1] |  |  |  |  | $ 115,828
Office Properties [Member] | Och Ziff Portfolio [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  | 58
Rentable Square Feet | ft² |  |  |  |  |  | 3,924,783
Sales Price |  |  |  |  |  | $ 398,100
Proceeds from the sale of properties |  |  |  |  |  | 353,971
Gain/(Loss) on Sale | [1],[7] |  |  |  |  | $ (372)
Retail Properties [Member] | 7000 Midlantic Drive [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 1 |
Rentable Square Feet | ft² |  |  |  |  | 10,784 |
Sales Price |  |  |  |  | $ 8,200 |
Proceeds from the sale of properties |  |  |  |  | 7,714 |
Gain/(Loss) on Sale | [1] |  |  |  | $ 1,413 |
Mixed-use Properties [Member] | Philadelphia Marine Center (Marine Piers) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 1 |
Rentable Square Feet | ft² |  |  |  |  | 181,900 |
Sales Price |  |  |  |  | $ 21,400 |
Proceeds from the sale of properties |  |  |  |  | 11,182 |
Gain/(Loss) on Sale | [1],[8] |  |  |  | $ 6,498 |
Office, Retail and Mixed-use Properties [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 20 |
Rentable Square Feet | ft² |  |  |  |  | 1,609,811 |
Sales Price |  |  |  |  | $ 159,900 |
Proceeds from the sale of properties |  |  |  |  | 142,720 |
Gain/(Loss) on Sale | [1] |  |  |  | $ 31,135 |
[1] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2] | As of March 31, 2017, the Company evaluated the recoverability of the carrying value of its properties that triggered assessment under the undiscounted cash flow model. Based on the Company’s evaluation, it was determined that due to the reduction in the Company’s intended hold period of four properties located in the Other segment, the Company would not recover the carrying values of these properties. Accordingly, the Company recorded impairment charges on these properties of $1.0 million at March 31, 2017, which reduced the aggregate carrying values of the properties from $10.2 million to their estimated fair value of $9.2 million. The Company measured these impairments based on a discounted cash flow analysis, using a hold period of 10 years and residual capitalization rates and discount rates of 9.00% and 9.25%, respectively. The results were comparable to indicative pricing in the market. The assumptions used to determine fair value under the income approach are Level 3 inputs in accordance with the fair value hierarchy established by Accounting Standards Codification (ASC) Topic 820, “Fair Value Measurements and Disclosures.” The loss on sale in the table above represents additional closing costs.
[3] | As of December 31, 2016, the Company evaluated the recoverability of the carrying value of its properties that triggered assessment under the undiscounted cash flow model. Based on the Company’s evaluation, it was determined that due to the reduction in the Company’s intended hold period of three properties located in the Other segment, the Company would not recover the carrying values of these properties. Accordingly, the Company recorded impairment charges on these properties of $7.3 million at December 31, 2016, reducing the aggregate carrying values of the properties from $25.8 million to their estimated fair value of $18.5 million. The Company measured these impairments based on a discounted cash flow analysis, using a hold period of 10 years and residual capitalization rates and discount rates of 8.75% and 9.00%, respectively. The results were comparable to indicative pricing in the market. The assumptions used to determine fair value under the income approach are Level 3 inputs in accordance with the fair value hierarchy established by Accounting Standards Codification (ASC) Topic 820, “Fair Value Measurements and Disclosures.” The loss on sale in the table above represents additional closing costs.
[4] | During the fourth quarter of 2016, the Company recognized a $3.0 million impairment related to these properties. During the first quarter of 2017, there was a price reduction of $1.7 million under the agreement of sale and an additional impairment of $1.7 million was recognized.
[5] | As of June 30, 2016, the Company determined that the sale of the property was probable and classified this property as held for sale in accordance with applicable accounting standards for long lived assets. At such date, the carrying value of the property exceeded the fair value less the anticipated costs of sale. As a result, the Company recognized a provision for impairment totaling approximately $1.8 million during the three-month period ended June 30, 2016. The fair value measurement was based on the pricing in the purchase and sale agreement for the sale of the property. As the pricing in the purchase and sale agreement is unobservable, the Company determined that the inputs utilized to determine fair value for this property falls within Level 3 in accordance with the fair value hierarchy established by Accounting Standards Codification (ASC) Topic 820, "Fair Value Measurements and Disclosures.” The loss on sale represents additional closing costs recognized at closing.
[6] | During the three-month period ended March 31, 2016, the Company recognized a provision for impairment totaling approximately $7.4 million on the properties. See “Held for Use Impairment” section below. The loss on sale primarily relates to additional closing costs recognized at closing.
[7] | During the three-month period ended December 31, 2015, the Company recognized a provision for impairment totaling approximately $45.4 million. The loss on sale represents additional closing costs recognized at closing.
[8] | On March 15, 2017, the Company sold its sublease interest in the Piers at Penn’s Landing (the “Marine Piers”), which includes leasehold improvements containing 181,900 net rentable square feet, and a marina, located in Philadelphia, Pennsylvania for an aggregate sales price of $21.4 million. On the closing date, the buyer paid $12.0 million in cash. The $9.4 million balance of the purchase is due on (a) January 31, 2020, in the event that the tenant at the Marine Piers does not exercise an option it holds to extend the term of the sublease or (b) January 15, 2024, in the event that the tenant does exercise the option to extend the term of the sublease. The Company determined that it is appropriate to account for the sales transaction under the cost recovery method. The Company received cash proceeds of $11.2 million, after closing costs and prorations, and the net book value of the Marine Piers was $4.7 million, resulting in a gain on sale of $6.5 million. The remaining gain on sale of $9.4 million will be recognized on the second purchase price installment date. Prior to its sale, the Marine Piers had been classified as mixed-use within the Company’s property count.

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