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Financial Instruments and Fair Value Measurements - Summary or Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Carrying value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | $ 299,900 | $ 299,600
Notes and bonds payable | 7,362,500 | 8,302,400
Estimated fair value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | 314,500 | 309,400
Notes and bonds payable | 8,045,600 | 9,324,000
Mortgages payable |  |
Fair value of financial assets and liabilities |  |
Unamortized net original issuance premiums | 1,600 | 1,700
Deferred financing costs at period end | 942 | 973
Notes and bonds payable |  |
Fair value of financial assets and liabilities |  |
Unamortized net original issuance premiums | 11,700 | 14,600
Deferred financing costs at period end | $ 44,100 | $ 49,200

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