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BUSINESS COMBINATIONS AND RELATED ACTIVITY - Valuation of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 16, 2024 | Sep. 01, 2024 | Jun. 01, 2024 | Apr. 01, 2024 | Mar. 31, 2024 | Feb. 01, 2024 | Dec. 31, 2023
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 711,841 |  |  |  |  |  |  | $ 679,463
Business Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration | 54,046 |  |  |  |  |  |  |
Property & Equipment | 27,509 |  |  |  |  |  |  |
Right of Use Assets | 25,302 |  |  |  |  |  |  |
Goodwill | 30,729 |  |  |  |  |  |  |
Intangible Assets | 2,315 |  |  |  |  |  |  |
Other Assets | 160 |  |  |  |  |  |  |
Right of Use Liabilities | (25,672) |  |  |  |  |  |  |
Notes payable | $ (6,297) |  |  |  |  |  |  |
Stanislaus Surgical Hospital, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  | $ 3,000 |  |  |  |  |  |
Property & Equipment |  | 504 |  |  |  |  |  |
Right of Use Assets |  | 1,468 |  |  |  |  |  |
Goodwill |  | 2,382 |  |  |  |  |  |
Intangible Assets |  | 100 |  |  |  |  |  |
Other Assets |  | 15 |  |  |  |  |  |
Right of Use Liabilities |  | (1,468) |  |  |  |  |  |
Notes payable |  | $ 0 |  |  |  |  |  |
Global Imaging LLP |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  |  | $ 2,900 |  |  |  |  |
Property & Equipment |  |  | 1,266 |  |  |  |  |
Right of Use Assets |  |  | 0 |  |  |  |  |
Goodwill |  |  | 1,584 |  |  |  |  |
Intangible Assets |  |  | 50 |  |  |  |  |
Other Assets |  |  | 0 |  |  |  |  |
Right of Use Liabilities |  |  | 0 |  |  |  |  |
Notes payable |  |  | $ 0 |  |  |  |  |
U.S. Imaging, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  |  |  | $ 4,200 |  |  |  |
Property & Equipment |  |  |  | 4,025 |  |  |  |
Right of Use Assets |  |  |  | 5,597 |  |  |  |
Goodwill |  |  |  | 0 |  |  |  |
Intangible Assets |  |  |  | 175 |  |  |  |
Other Assets |  |  |  | 0 |  |  |  |
Right of Use Liabilities |  |  |  | (5,597) |  |  |  |
Notes payable |  |  |  | $ 0 |  |  |  |
Houston Medical Imaging, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  | $ 22,703 |  |  |
Property & Equipment |  |  |  |  | 15,826 |  |  |
Right of Use Assets |  |  |  |  | 7,929 |  |  |
Goodwill |  |  |  |  | 11,584 |  |  |
Intangible Assets |  |  |  |  | 1,660 |  |  |
Other Assets |  |  |  |  | 90 |  |  |
Right of Use Liabilities |  |  |  |  | (8,089) |  |  |
Notes payable |  |  |  |  | $ (6,297) |  |  |
Grossman Imaging Center of CMH, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  | $ 10,344 |  |
Property & Equipment |  |  |  |  |  | 1,717 |  |
Right of Use Assets |  |  |  |  |  | 6,304 |  |
Goodwill |  |  |  |  |  | 8,501 |  |
Intangible Assets |  |  |  |  |  | 280 |  |
Other Assets |  |  |  |  |  | 56 |  |
Right of Use Liabilities |  |  |  |  |  | (6,514) |  |
Notes payable |  |  |  |  |  | 0 |  |
Providence Health System - Southern California |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  | 7,369 |  |
Property & Equipment |  |  |  |  |  | 1,378 |  |
Right of Use Assets |  |  |  |  |  | 3,441 |  |
Goodwill |  |  |  |  |  | 5,991 |  |
Intangible Assets |  |  |  |  |  | 0 |  |
Other Assets |  |  |  |  |  | 0 |  |
Right of Use Liabilities |  |  |  |  |  | (3,441) |  |
Notes payable |  |  |  |  |  | $ 0 |  |
Antelope Valley Outpatient Imaging |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  | $ 3,530 |
Property & Equipment |  |  |  |  |  |  | 2,794 |
Right of Use Assets |  |  |  |  |  |  | 563 |
Goodwill |  |  |  |  |  |  | 687 |
Intangible Assets |  |  |  |  |  |  | 50 |
Other Assets |  |  |  |  |  |  | 0 |
Right of Use Liabilities |  |  |  |  |  |  | (563) |
Notes payable |  |  |  |  |  |  | $ 0 |

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