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Investments in Unconsolidated Joint Ventures (Liberty Washington, LP) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
bldg
Dec. 31, 2017
USD ($)
bldg
Dec. 31, 2016
USD ($)
a
ft²
bldg
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg 60    
Impairment - real estate assets $ 32,431 $ 3,946 $ 3,879
Gain (loss) on debt extinguishment 0 (49) (27,099)
Management fee income $ 73,224 $ 82,673 12,941
Discontinued Operations, Disposed of by Sale      
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg 37 2  
Discontinued operations      
Schedule of Equity Method Investments [Line Items]      
Impairment - real estate assets $ 7,257 $ 6,686 $ 0
Northern Virginia and Washington DC | Liberty Washington, LP      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 25.00%    
Building and Building Improvements | Northern Virginia and Washington DC | Liberty Washington, LP      
Schedule of Equity Method Investments [Line Items]      
Leaseable square feet (in sqft) | ft² 451    
Building and Building Improvements | Northern Virginia and Washington DC | Office properties | Liberty Washington, LP      
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg 2    
Joint venture, 2016 sales current quarter | Building and Building Improvements | Liberty Washington, LP | Discontinued Operations, Disposed of by Sale      
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg     12
Leaseable square feet (in sqft) | ft²     1,200
Proceeds from sale of property     $ 187,200
Joint venture, 2016 sales current quarter | Land and Land Improvements | Liberty Washington, LP | Discontinued Operations, Disposed of by Sale      
Schedule of Equity Method Investments [Line Items]      
Acres of developable land (in acres) | a     6.0
Joint venture, 2016 transfer to lender | Building and Building Improvements | Liberty Washington, LP | Discontinued Operations, Disposed of by Means Other than Sale      
Schedule of Equity Method Investments [Line Items]      
Number of buildings (in buildings) | bldg     6
Leaseable square feet (in sqft) | ft²     698
Mortgages | Joint venture, 2016 transfer to lender | Building and Building Improvements | Liberty Washington, LP | Discontinued Operations, Disposed of by Means Other than Sale      
Schedule of Equity Method Investments [Line Items]      
Extinguishment of debt     $ 112,500
Equity Method Investee | DC Metro | Liberty Washington, LP      
Schedule of Equity Method Investments [Line Items]      
Impairment - real estate assets $ 25,400 15,900  
General Partner | Gain (Loss) on Investments | Joint venture, 2016 sales current quarter | Building and Building Improvements | Liberty Washington, LP | Discontinued operations      
Schedule of Equity Method Investments [Line Items]      
Gains on sale of land and building     6,000
General Partner | Gain (Loss) on Investments | Mortgages | Joint venture, 2016 transfer to lender | Building and Building Improvements | Liberty Washington, LP | Discontinued operations      
Schedule of Equity Method Investments [Line Items]      
Gain (loss) on debt extinguishment     4,200
Liberty Washington, LP | Equity Method Investee | Northern Virginia and Washington DC      
Schedule of Equity Method Investments [Line Items]      
Management fee income 1,200 1,100 $ 2,000
Prepaid Expenses and Other Current Assets | Liberty Washington, LP | Equity Method Investee | Northern Virginia and Washington DC      
Schedule of Equity Method Investments [Line Items]      
Due from related parties 1 316  
Investments in and advances to unconsolidated joint ventures | General Partner | Equity Method Investee | DC Metro | Liberty Washington, LP      
Schedule of Equity Method Investments [Line Items]      
Impairment - real estate assets $ 6,300 $ 4,000