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Basis of Presentation and Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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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 |

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- Definition Number of Variable Interest Entities (VIE) or potential VIEs for which the necessary information is unable to be obtained to: (1) determine whether the legal entity is a VIE, (2) determine whether it (the reporting entity) is the VIE's primary beneficiary, or (3) perform the accounting required to consolidate the VIE for which it is determined that it (the reporting entity) is the primary beneficiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685 + Details
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