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Intangible Assets, net - Amortization Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 2,367 $ 1,715 $ 1,541
Tradenames [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 330 84 86
Referral Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 1,512 1,153 1,028
Non-compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 525 $ 478 $ 427