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Financial Instruments and Fair Value Measurements - Summary of Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Carrying value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | $ 299,600 | $ 408,400
Notes and bonds payable | 8,302,400 | 6,317,600
Estimated fair value |  |
Fair value of financial assets and liabilities |  |
Mortgages payable assumed in connection with acquisitions | 309,400 | 417,700
Notes and bonds payable | 9,324,000 | 6,826,100
Mortgages payable |  |
Fair value of financial assets and liabilities |  |
Unamortized net original issuance premiums | 1,700 | 3,000
Deferred financing costs | 973 | 1,300
Notes and bonds payable |  |
Fair value of financial assets and liabilities |  |
Unamortized net original issuance premiums | 14,600 | 6,300
Deferred financing costs | $ 49,200 | $ 35,900

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