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Goodwill and Intangible Assets (Composition of Goodwill and Intangible Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 90,375 $ 88,883 $ 92,279
Total intangible assets 36,576 36,480  
Accumulated amortization (19,768) (17,899)  
Total intangible assets, net 16,808 18,581  
Licenses And Others [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Amortizable intangible assets 5,415 5,406  
Non-Compete Agreement [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Amortizable intangible assets 2,803 3,028  
Customer Lists [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Amortizable intangible assets 14,915 14,897  
Trademarks [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Amortizable intangible assets 4,680 4,565  
Trademarks [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives $ 8,763 $ 8,584