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OTHER ASSETS | 12 Months Ended
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Dec. 31, 2023
OTHER ASSETS | 8. OTHER ASSETS Other assets consist of the following (in thousands):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Intangible assets, less accumulated amortization of $2,307 and $2,435, respectively |  | $ | 7,173 |  |  | $ | 7,724 |
Financing receivable - Kansas lease |  |  | 138,989 |  |  |  | 142,214 |
ROU lease assets |  |  | 119,773 |  |  |  | 145,539 |
Lease incentive assets |  |  | — |  |  |  | 3,529 |
Debt issuance costs for revolving credit facility, less accumulated amortization of $180 and $765, respectively |  |  | 3,397 |  |  |  | 3,343 |
Cash equivalents and cash surrender value of life insurance held in rabbi trust |  |  | 16,545 |  |  |  | 15,988 |
Straight-line rent receivable |  |  | 1,854 |  |  |  | 2,378 |
Insurance receivable |  |  | 15,966 |  |  |  | 14,144 |
Note receivable from APM |  |  | 2,886 |  |  |  | 2,741 |
Other |  |  | 2,975 |  |  |  | 4,376 |
|  | $ | 309,558 |  |  | $ | 341,976 |
The gross carrying amount of intangible assets amounted to $9.5 million and $10.1 million at December 31, 2023 and 2022, respectively. Amortization expense related to intangible assets was $0.5 million, $1.3 million, and $1.9 million for 2023, 2022, and 2021, respectively, and was reported as depreciation and amortization in the accompanying statement of operations for the respective periods. As of December 31, 2023, the estimated amortization expense related to intangible assets for each of the next five years is as follows (in thousands):
2024 |  | $ | 454 |
2025 |  |  | 454 |
2026 |  |  | 454 |
2027 |  |  | 454 |
2028 |  |  | 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
Name: | us-gaap_OtherAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration