XML 63 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
Intangible Assets, net - Amortization Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 2,654 $ 2,367 $ 1,715
Tradenames [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 0 330 84
Referral Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 1,934 1,512 1,153
Non-compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 720 $ 525 $ 478