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INTANGIBLE ASSETS, NET - Intangible Assets, Net (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | $ 49,311 | $ 48,954
Tradenames [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | 29,631 | 29,673
Referral Relationships [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Total | 17,771 | 16,811
Accumulated amortization | $ 8,857 | 7,209
Referral Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Estimated useful life | 5 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 | $ 1,909 | 2,470
Accumulated amortization | $ 4,560 | $ 4,100
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 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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