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Investments in Unconsolidated Joint Ventures (Investments in Unconsolidated Joint Ventures) (Details)
$ in Thousands

6 Months Ended

Jun. 27, 2019

ft²

Apr. 26, 2019

USD ($)

ft²

yr

Jun. 30, 2019

USD ($)

ft²

Land_Parcels

Buildings

payments

Dec. 31, 2018

USD ($)

Schedule of Equity Method Investments [Line Items]

Carrying Value of investment

$ (355,984)

$ (503,726)

Carrying value of the Company's investments in unconsolidated joint ventures

$ 936,835

956,309

Square 407 Limited Partnership [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Market Square North

Ownership Percentage

50.00%

Carrying Value of investment

^[1]

$ (5,518)

(6,424)

The Metropolitan Square Associates LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Metropolitan Square

Ownership Percentage

20.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 5,827

2,644

BP/CRF 901 New York Avenue LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

901 New York Avenue

Ownership Percentage

^[2]

25.00%

Carrying Value of investment

^[1]

$ (12,859)

(13,640)

WP Project Developer LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Wisconsin Place Land and Infrastructure

Ownership Percentage

^[3]

33.30%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 37,521

38,214

Annapolis Junction NFM, LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Annapolis Junction

Ownership Percentage

^[4]

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 25,290

25,268

Number of real estate properties | Buildings

3

Parcels of undeveloped land | Land_Parcels

2

540 Madison Venture LLC [Member]

Schedule of Equity Method Investments [Line Items]

Debt Instrument, Basis Spread on Variable Rate

1.10%

Properties

540 Madison Avenue

Ownership Percentage

60.00%

60.00%

^[5]

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 9,200

66,391

Net Rentable Area (in sf) | ft²

284,000

500 North Capitol Venture LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

500 North Capitol Street, NW

Ownership Percentage

30.00%

Carrying Value of investment

^[1]

$ (5,451)

(5,026)

501 K Street LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

1001 6th Street

Ownership Percentage

^[6]

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 42,473

42,557

Potential additonal payments to joint venture partner | payments

2

Minimum square footage to make a potential additional payment to joint venture partner (in sqft) | ft²

520,000

Podium Developer LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

The Hub on Causeway - Podium

Ownership Percentage

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 58,637

69,302

Residential Tower Developer LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

The Hub on Causeway - Residential

Ownership Percentage

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 48,201

47,505

Hotel Tower Developer LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

The Hub on Causeway - Hotel Air Rights

Ownership Percentage

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 3,626

3,022

Office Tower Developer LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

100 Causeway Street

Ownership Percentage

^[7]

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 69,551

23,804

1265 Main Office JV LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

1265 Main Street

Ownership Percentage

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 4,125

3,918

BNY Tower Holdings LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Dock 72

Ownership Percentage

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 91,134

82,520

CA-Colorado Center Limited Partnership [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Colorado Center

Ownership Percentage

50.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 254,122

253,495

7750 Wisconsin Avenue LLC [Member]

Schedule of Equity Method Investments [Line Items]

Construction Loan Facility Borrowing Capacity

$ 255,000

Number of extensions

2

Extension Option (in years) | yr

1

Debt Instrument, Basis Spread on Variable Rate

1.25%

Properties

7750 Wisconsin Avenue

Ownership Percentage

50.00%

50.00%

^[7]

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 70,122

69,724

Net Rentable Area (in sf) | ft²

734,000

BP-M 3HB Venture LLC [Member]

Schedule of Equity Method Investments [Line Items]

Properties

3 Hudson Boulevard

Ownership Percentage

25.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 47,966

46,993

SMBP Venture LP [Member]

Schedule of Equity Method Investments [Line Items]

Properties

Santa Monica Business Park

Ownership Percentage

55.00%

Carrying value of the Company's investments in unconsolidated joint ventures

^[1]

$ 169,040

180,952

Unconsolidated Joint Ventures [Member]

Schedule of Equity Method Investments [Line Items]

Carrying Value of investment

23,800

25,100

Unconsolidated Joint Ventures [Member]

Schedule of Equity Method Investments [Line Items]

Carrying Value of investment

(656,902)

^[8]

(582,006)

Carrying value of the Company's investments in unconsolidated joint ventures

^[1],[9]

$ 913,007

$ 931,219

[1]	Investments with deficit balances aggregating approximately $23.8 million and $25.1 million at June 30, 2019 and December 31, 2018, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.
[2]	The Company’s economic ownership has increased based on the achievement of certain return thresholds.
[3]	The Company’s wholly-owned subsidiary that owns Wisconsin Place Office also owns a 33.3% interest in the joint venture entity that owns the land, parking garage and infrastructure of the project.
[4]	The joint venture owns three in-service buildings and two undeveloped land parcels.
[5]	The property was sold on June 27, 2019. As of June 30, 2019, the investment is comprised of undistributed cash. See note below for additional details.
[6]	Under the joint venture agreement for this land parcel, the partner will be entitled to up to two additional payments from the venture based on increases in total entitled square footage of the project above 520,000 square feet and achieving certain project returns at stabilization.
[7]	This entity is a VIE (See Note 2).
[8]	At June 30, 2019, this amount includes lease liabilities - finance leases and lease liabilities - operating leases totaling approximately $393.2 million and $17.2 million, respectively.
[9]	Investments with deficit balances aggregating approximately $23.8 million and $25.1 million at June 30, 2019 and December 31, 2018, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheet

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