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OTHER ASSETS | 12 Months Ended
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Dec. 31, 2021
OTHER ASSETS |
8. | OTHER ASSETS
Other assets consist of the following (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Intangible assets, less accumulated amortization of $12,236 and $10,351, respectively |  | $ | 8,998 |  |  | $ | 10,866 |
Financing receivable - Kansas lease |  |  | 145,036 |  |  |  | 147,481 |
ROU lease assets |  |  | 169,968 |  |  |  | 194,080 |
Lease incentive assets |  |  | 4,171 |  |  |  | 4,813 |
Debt issuance costs, less accumulated amortization of $3,173 and $2,332, respectively |  |  | 1,020 |  |  |  | 1,855 |
Cash equivalents and cash surrender value of life insurance held in Rabbi trust |  |  | 15,453 |  |  |  | 14,940 |
Straight-line rent receivable |  |  | 648 |  |  |  | 2,196 |
Insurance receivable |  |  | 13,522 |  |  |  | 14,353 |
Note receivable from APM |  |  | 3,063 |  |  |  | 3,094 |
Other |  |  | 2,660 |  |  |  | 2,985 |
|  | $ | 364,539 |  |  | $ | 396,663 |
The gross carrying amount of intangible assets amounted to $21.2 million at both December 31, 2021 and 2020. Amortization expense related to intangible assets was $1.9 million, $9.1 million, and $6.8 million for 2021, 2020, and 2019, 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, 2021, the estimated amortization expense related to intangible assets for each of the next five years is as follows (in thousands):
2022 |  | $ | 1,323 |
2023 |  |  | 489 |
2024 |  |  | 466 |
2025 |  |  | 462 |
2026 |  |  | 454 |

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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: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration