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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | $ 50,055 | $ 48,828
Tradenames [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | 30,756 | 30,256
Referral Relationships [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | 17,428 | 16,895
Accumulated amortization | $ 10,121 | 9,370
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 | $ 1,871 | 1,677
Accumulated amortization | $ 4,730 | $ 4,716
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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