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Leases ASC 842 (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) propertyUnit | Dec. 31, 2019 USD ($)
Lessor Disclosure [Abstract] |  |
Rental and other revenues related to operating lease payments | $ 726,000 | $ 723,100
Variable lease payments | 56,000 | 65,400
Operating leases, scheduled future minimum payments receivable [Abstract] |  |
2021 | 623,888 |
2022 | 619,530 |
2023 | 570,417 |
2024 | 513,483 |
2025 | 432,272 |
Thereafter | 2,049,545 |
Operating leases, total future minimum payments receivable due | $ 4,809,135 |
Lessee Disclosure [Abstract] |  |
Number of properties subject to ground leases | propertyUnit | 20 |
Weighted average remaining term of ground leases (in years) | 51 years |
Operating lease liability upon initial adoption | $ 35,300 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |
Right of use asset upon initial adoption | $ 29,700 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PrepaidExpenseAndOtherAssets |
Operating lease discount rate (in hundredths) | 4.50% |
Operating ground lease expense | $ 2,600 | 2,500
Operating ground lease payments | 2,200 | $ 2,200
Operating ground lease liabilities, scheduled future minimum payments [Abstract] |  |
2021 | 2,127 |
2022 | 2,169 |
2023 | 2,167 |
2024 | 2,123 |
2025 | 2,170 |
Thereafter | 81,527 |
Operating ground lease liability, total future minimum payments | 92,283 |
Operating lease liability discount | (57,892) |
Operating lease liability | $ 34,391 |
Minimum [Member] |  |
Lessor Disclosure [Abstract] |  |
Operating leases, term of leases | 3 years |
Maximum [Member] |  |
Lessor Disclosure [Abstract] |  |
Operating leases, term of leases | 10 years |

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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lease payments to be received by lessor for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of lease payment to be received by lessor for operating lease in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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