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OTHER ASSETS | 12 Months Ended
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Dec. 31, 2020
OTHER ASSETS |
9. | OTHER ASSETS
Other assets consist of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Intangible assets: |  |  |  |  |  |  |  |
Deferred leasing assets, less accumulated amortization of $1,132 and $5,647, respectively |  | $ | 146 |  |  | $ | 41,129 |
Other intangible assets, less accumulated amortization of $9,219 and $8,182, respectively |  |  | 10,720 |  |  |  | 14,517 |
Construction receivable - Kansas lease |  |  | — |  |  |  | 137,665 |
Financing receivable - Kansas lease |  |  | 147,481 |  |  |  | — |
ROU lease assets |  |  | 194,080 |  |  |  | 108,118 |
Lease incentive assets |  |  | 4,813 |  |  |  | 5,454 |
Debt issuance costs, less accumulated amortization of $2,332 and $1,475, respectively |  |  | 1,855 |  |  |  | 2,628 |
Cash equivalents and cash surrender value of life insurance held in Rabbi trust |  |  | 14,940 |  |  |  | 14,448 |
Straight-line rent receivable |  |  | 2,196 |  |  |  | 7,836 |
Insurance receivable |  |  | 14,353 |  |  |  | 13,179 |
Other |  |  | 6,079 |  |  |  | 5,933 |
|  | $ | 396,663 |  |  | $ | 350,907 |
The gross carrying amount of intangible assets amounted to $21.2 million and $69.5 million at December 31, 2020 and 2019, respectively. Amortization expense related to intangible assets, including those associated with the three properties held for sale at December 31, 2020, as previously described in Note 6, was $9.1 million, $6.8 million, and $6.5 million for 2020, 2019, and 2018, respectively, and depending upon the nature of the asset, was either reported as operating expense or depreciation and amortization in the accompanying statement of operations for the respective periods. As of December 31, 2020, the estimated amortization expense related to intangible assets, including the expense associated with the three properties held for sale at December 31, 2020, for each of the next five years is as follows (in thousands):
2021 |  | $ | 4,853 |
2022 |  |  | 4,253 |
2023 |  |  | 3,308 |
2024 |  |  | 3,272 |
2025 |  |  | 3,268 |

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- Definition The entire disclosure for other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration