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Basis of Presentation and Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
property
variable_interest_entity
investment
segment
property_partnership
Dec. 31, 2020
USD ($)
investment
property
variable_interest_entity
Dec. 31, 2019
USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of VIEs | variable_interest_entity 2 2  
Assets $ 10,583,397,000 $ 10,000,708,000  
Liabilities 4,893,527,000 4,723,387,000  
Noncontrolling interest in consolidated subsidiary $ 196,064,000 $ 197,503,000  
Number of equity method investments | investment 0 0  
Number of properties classified as held for sale | property 0 0  
Number of consolidated property partnerships | property_partnership 3    
Conversion ratio 1    
Income tax provision $ 0 $ 0 $ 0
Number of operating segments | segment 1    
Building and building improvements      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Depreciation of real estate $ 256,300,000 244,800,000 $ 211,900,000
Stabilized Office Properties | Washington      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Number of buildings | property 9    
Minimum | Building and building improvements      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property depreciable lives 25 years    
Minimum | Leasehold improvements      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property depreciable lives 1 year    
Maximum | Building and building improvements      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property depreciable lives 40 years    
Maximum | Leasehold improvements      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Property depreciable lives 20 years    
Lease Agreements | Minimum      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Finite-lived intangible asset, useful life 1 year    
Lease Agreements | Maximum      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Finite-lived intangible asset, useful life 20 years    
Disposal group, disposed of by sale      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Restricted cash $ 0 74,900,000  
Variable Interest Entity, Primary Beneficiary      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Assets 462,300,000 469,300,000  
Liabilities 28,100,000 33,900,000  
Variable Interest Entity, Primary Beneficiary | 100 First LLC and 303 Second LLC      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Noncontrolling interest in consolidated subsidiary 190,700,000 191,900,000  
Variable Interest Entity, Primary Beneficiary | Real estate investment      
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]      
Assets $ 377,900,000 $ 394,600,000