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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Intangible Assets |  |  |
Amortization expense attributable to intangible assets | $ 1,200 | $ 3,800 | $ 4,900
Original Cost | 12,123 | 12,123 |
Accumulated Amortization | (11,095) | (9,922) |
Intangibles, Net | 1,028 | 2,201 |
Estimated amortization expense attributable to intangible assets |  |  |
2023 | 54 |  |
2024 | 54 |  |
2025 | 54 |  |
2026 | 54 |  |
2027 | 54 |  |
Thereafter | 758 |  |
Customer contracts, net |  |  |
Intangible Assets |  |  |
Original Cost | 10,623 | 10,623 |
Accumulated Amortization | (10,623) | (9,504) |
Intangibles, Net |  | 1,119 |
Permits |  |  |
Intangible Assets |  |  |
Original Cost | 1,500 | 1,500 |
Accumulated Amortization | (472) | (418) |
Intangibles, Net | $ 1,028 | $ 1,082 |

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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 https://asc.fasb.org/extlink&oid=126954810&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 https://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 https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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