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Intangible Assets, net (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Operation
Finite-Lived Intangible Assets [Line Items] |  |
Total | $ 48,954 | $ 38,060
Number of acquired operations | Operation |  | 2
Tradenames [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 29,673 | $ 21,234
Referral Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | 16,811 | 14,859
Accumulated amortization | $ 7,209 | 5,275
Referral Relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 6 years |
Referral Relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 16 years |
Non-compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total | $ 2,470 | 1,967
Accumulated amortization | $ 4,100 | $ 3,380
Non-compete Agreements [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 5 years |
Non-compete Agreements [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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