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Identified Intangible Assets and Liabilities
 9 Months Ended
Sep. 30, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Identified Intangible Assets and Liabilities Identified Intangible Assets and Liabilities
The following summarizes our identified intangible assets (primarily above-market leases) and liabilities (primarily below-market leases).
(Amounts in thousands)Balance as of
September 30, 2020December 31, 2019
Identified intangible assets:
Gross amount$121,313 $129,552 
Accumulated amortization(95,567)(98,587)
Total, net$25,746 $30,965 
Identified intangible liabilities (included in deferred revenue):
Gross amount$292,730 $316,119 
Accumulated amortization(252,554)(262,580)
Total, net$40,176 $53,539 
Amortization of acquired below-market leases, net of acquired above-market leases, resulted in an increase to rental revenues of $3,648,000 and $4,393,000 for the three months ended September 30, 2020 and 2019, respectively, and $13,054,000 and $15,561,000 for the nine months ended September 30, 2020 and 2019, respectively. Estimated annual amortization of acquired below-market leases, net of acquired above-market leases, for each of the five succeeding years commencing January 1, 2021 is as follows:
(Amounts in thousands)
2021$10,909 
20229,366 
20236,837 
20243,092 
20251,539 
Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $1,838,000 and $1,597,000 for the three months ended September 30, 2020 and 2019, respectively, and $4,919,000 and $7,077,000 for the nine months ended September 30, 2020 and 2019, respectively. Estimated annual amortization of all other identified intangible assets including acquired in-place leases for each of the five succeeding years commencing January 1, 2021 is as follows:
(Amounts in thousands)
2021$4,327 
20223,789 
20233,703 
20243,089 
20252,173