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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | $ 55,648 | $ 52,588
Tradenames [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | 33,549 | 32,049
Referral Relationships [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | 19,354 | 18,367
Accumulated amortization | $ 12,290 | 11,677
Referral Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Estimated useful life | 6 years |
Referral Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Estimated useful life | 16 years |
Non-compete Agreements [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | $ 2,745 | 2,172
Accumulated amortization | $ 5,601 | $ 5,424
Non-compete Agreements [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Estimated useful life | 5 years |
Non-compete Agreements [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Estimated useful life | 6 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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