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Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Operating properties | $ 4,004,118 | $ 4,006,459
Right of use asset - operating leases, net | 21,485 | 21,656
Construction-in-progress | 193,160 | 180,718
Land held for development | 108,213 | 96,124
Prepaid leasehold interests in land held for development, net | 39,490 | 39,592
Philadelphia CBD |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 1,733,987 | 1,726,299
Pennsylvania Suburbs |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 991,788 | 1,003,890
Austin, Texas |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 722,873 | 721,255
Metropolitan Washington, D.C. |  |
Segment Reporting Information [Line Items] |  |
Operating properties | 468,416 | 468,035
Other |  |
Segment Reporting Information [Line Items] |  |
Operating properties | $ 87,054 | $ 86,980

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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