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Business Combinations, Goodwill and Intangible Assets (Composition of Goodwill and Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 91,379 $ 86,545 $ 68,829
Trademarks 13,221 13,074  
Total intangible assets 37,393 36,351  
Accumulated amortization (8,337) (7,360)  
Total intangible assets, net 29,056 28,991  
Licenses And Others [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 8,562 8,691  
Non-Compete Agreement/Solicitation [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 1,862 1,615  
Customer Lists [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 13,748 $ 12,971