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Real Estate Properties - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 02, 2017
USD ($)
ft²
property
joint_venture
Jan. 31, 2020
USD ($)
Nov. 30, 2019
USD ($)
Feb. 28, 2018
USD ($)
ft²
Oct. 31, 2017
USD ($)
ft²
property
Sep. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
ft²
property
Dec. 31, 2019
USD ($)
ft²
property
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
ft²
property
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
ft²
property
joint_venture
lease
Dec. 31, 2018
USD ($)
ft²
property
Dec. 31, 2017
USD ($)
ft²
property
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2017
USD ($)
ft²
Real Estate Properties [Line Items]                                        
Carrying value               $ 3,555,131               $ 3,555,131        
Number of properties, noncontrolling interest | property                               2        
Number of leases entered | lease                               107        
Rentable square feet (in sqft) | ft²                               2,900,000        
Weighted average lease term                               8 years 7 months 6 days        
Expenditures committed on leases                               $ 77,541        
Operating leases committed expenditures on leases executed in period committed but unspent tenant related obligations               55,984               $ 55,984        
Number of joint ventures | joint_venture                               2        
Revenues               160,184 $ 167,411 $ 176,032 $ 174,777 $ 103,656 $ 106,102 $ 108,085 $ 108,717 $ 678,404 $ 426,560   $ 316,532  
Loss on impairment of real estate                               22,255 8,630   9,490  
Real estate properties, net               $ 3,105,575       $ 3,569,489       $ 3,105,575 $ 3,569,489      
Continuing Operations                                        
Real Estate Properties [Line Items]                                        
Number of properties owned | property               189               189        
Area of properties (in square feet) | ft²               25,700,000               25,700,000        
Number of Properties | property               189               189        
SIR                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft²                       16,500,000         16,500,000      
Number of properties acquired | property                                 99      
Total consideration transferred and liabilities assumed                                 $ 2,409,740      
Payments to acquire business, gross                                 8      
Liabilities assumed                                 1,719,772      
First Potomac Realty Trust                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft² 6,000,000.0             400,000               400,000        
Number of properties acquired | property 72                                      
Total consideration transferred and liabilities assumed $ 1,370,888                                      
Payments to acquire business, gross 1,175,140                                      
Liabilities assumed 483,000                                      
Long term debt acquired 167,936                                      
Mortgages | SIR                                        
Real Estate Properties [Line Items]                                        
Long term debt acquired                       $ 159,490         $ 159,490      
FPO Mortgage | Mortgages | First Potomac Realty Trust                                        
Real Estate Properties [Line Items]                                        
Long term debt acquired 167,548                                      
Joint Venture Mortgage | Mortgages | First Potomac Realty Trust                                        
Real Estate Properties [Line Items]                                        
Long term debt acquired $ 82,000                                      
Disposal Group, Held-for-sale                                        
Real Estate Properties [Line Items]                                        
Number of properties owned | property                       34         34      
Carrying value               $ 61,900               $ 61,900        
Loss on impairment of real estate                                 $ 2,830      
Disposal Group, Disposed of by Sale                                        
Real Estate Properties [Line Items]                                        
Number of properties owned | property               58       19       58 19      
Area of properties (in square feet) | ft²               6,178,461       2,200,000       6,178,461 2,200,000      
Number of Properties | property               58               58        
Purchase price                               $ 848,853        
Aggregate sale price of properties sold, excluding closing costs                               848,853 $ 320,255      
Loss on impairment of real estate                               $ 12,801        
Office Property | One Property | Disposal Group, Disposed of by Sale                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft²                       2,174,637         2,174,637      
Number of Properties | property                       19         19      
Aggregate sale price of properties sold, excluding closing costs                                 $ 320,255      
Loss on impairment of real estate                                 3,669      
Safford, AZ | Disposal Group, Disposed of by Sale                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft²       36,139                                
Aggregate sale price of properties sold, excluding closing costs       $ 8,250                                
Loss on impairment of real estate                             $ 2,453   $ 322      
Albuquerque, NM | Office Property | One Property | Disposal Group, Disposed of by Sale                                        
Real Estate Properties [Line Items]                                        
Number of properties owned | property         1                              
Area of properties (in square feet) | ft²         29,045                              
Aggregate sale price of properties sold, excluding closing costs         $ 2,000                              
Loss on impairment of real estate                                     230  
Real estate properties, net         $ 1,885                              
Falls Church, VA                                        
Real Estate Properties [Line Items]                                        
Number of properties owned | property             1                          
Area of properties (in square feet) | ft²             164,746                          
Real estate properties, net             $ 12,901                          
Falls Church, VA | Office Property | One Property | Discontinued Operations                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft²             200,000                          
Aggregate sale price of properties sold, excluding closing costs             $ 13,523                          
Real estate properties, net             $ 12,901                          
Increase the carrying value of property                                     $ (619)  
Boston, MA                                        
Real Estate Properties [Line Items]                                        
Purchase price     $ 2,900                                  
Manassas, VA                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft²                                   69,374 69,374 69,374
Purchase price                                     $ 12,657  
Percentage of property lease                                       100.00%
Capitalized transaction costs                                   $ 37 $ 37 $ 37
Manassas, VA | Office Property                                        
Real Estate Properties [Line Items]                                        
Number of properties acquired                                   1   1
Washington, D.C. | Transferable Development Rights                                        
Real Estate Properties [Line Items]                                        
Payments to acquire intangible assets           $ 2,030                            
Joint Venture Property 1                                        
Real Estate Properties [Line Items]                                        
Percentage of ownership interest               50.00%               50.00%        
Joint Venture Property 2                                        
Real Estate Properties [Line Items]                                        
Percentage of ownership interest               51.00%               51.00%        
Unconsolidated Joint Ventures                                        
Real Estate Properties [Line Items]                                        
Number of properties owned | property               3               3        
Area of properties (in square feet) | ft²               443,867               443,867        
Number of Properties | property               3               3        
Equity method investment, difference between carrying amount and underlying equity               $ 7,951               $ 7,951        
Above Market Lease                                        
Real Estate Properties [Line Items]                                        
Acquired finite-lived intangible assets, weighted average useful life 3 years 2 months 12 days                               5 years 9 months 18 days      
Lease Agreements                                        
Real Estate Properties [Line Items]                                        
Acquired finite-lived intangible assets, weighted average useful life 3 years 1 month 6 days                               7 years 2 months 12 days      
Capitalized Below Market Leases                                        
Real Estate Properties [Line Items]                                        
Below market, acquired lease amortization period 3 years 9 months 18 days                               5 years 8 months 12 days      
First Potomac Realty Trust                                        
Real Estate Properties [Line Items]                                        
Number of joint ventures | joint_venture 2                             2        
Number of Properties | property 3             3               3        
First Potomac Realty Trust | First Potomac Realty Trust                                        
Real Estate Properties [Line Items]                                        
Area of properties (in square feet) | ft² 400,000                                      
First Potomac Realty Trust | Joint Venture Property 1                                        
Real Estate Properties [Line Items]                                        
Percentage of ownership interest 50.00%             51.00%               51.00%        
First Potomac Realty Trust | Joint Venture Property 2                                        
Real Estate Properties [Line Items]                                        
Percentage of ownership interest 51.00%             50.00%               50.00%        
FPO Shareholders | First Potomac Realty Trust                                        
Real Estate Properties [Line Items]                                        
Payments to acquire business, gross $ 651,696                                      
Acquisition-related Costs                                        
Real Estate Properties [Line Items]                                        
Revenues                                 $ (152,735)      
Net income                                 $ (46,237)      
Subsequent Event | Boston, MA                                        
Real Estate Properties [Line Items]                                        
Purchase price   $ 11,500