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Other Assets, Net Lease and Other Intangible Asset Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amortization of Intangible Assets | $ 15,953 | $ 21,561 | $ 14,954
In-place lease amortization (1) |  |  |
Amortization of Intangible Assets | 7,375 | 11,807 | 10,216
Above-market real estate lease amortization (2) |  |  |
Amortization of Intangible Assets | 1,730 | 2,390 | 1,428
Below-market ground lease amortization (3) |  |  |
Amortization of Intangible Assets | 0 | 85 | 87
Management and leasing contract amortization (1) |  |  |
Amortization of Intangible Assets | 7,088 | 7,088 | 3,209
Other amortization (1) |  |  |
Amortization of Intangible Assets | $ (240) | $ 191 | $ 14

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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