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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible Assets |  |  |
Amortization expense attributable to intangible assets | $ 9,100 | $ 6,900 | $ 10,500
Original Cost | 43,674 | 34,197 |
Accumulated Amortization | (34,005) | (24,919) |
Intangibles, Net | 9,669 | 9,278 |
Estimated amortization expense attributable to intangible assets |  |  |
2020 | 4,495 |  |
2021 | 2,952 |  |
2022 | 647 |  |
2023 | 647 |  |
2024 | 66 |  |
Thereafter | 862 |  |
Noncompete agreement |  |  |
Intangible Assets |  |  |
Original Cost | 9,803 | 9,697 |
Accumulated Amortization | (9,440) | (8,385) |
Intangibles, Net | 363 | 1,312 |
Customer contracts, net |  |  |
Intangible Assets |  |  |
Original Cost | 32,371 | 23,000 |
Accumulated Amortization | (24,258) | (16,293) |
Intangibles, Net | 8,113 | 6,707 |
Permits |  |  |
Intangible Assets |  |  |
Original Cost | 1,500 | 1,500 |
Accumulated Amortization | (307) | (241) |
Intangibles, Net | $ 1,193 | $ 1,259 |

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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=118932676&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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