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Summary of Significant Accounting Policies (Goodwill Impairment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]      
Impairment of goodwill $ 200 $ 5,045 $ 679
Mexico [Member]      
Goodwill [Line Items]      
Impairment of goodwill $ 200    
Argentina [Member]      
Goodwill [Line Items]      
Impairment of goodwill   $ 5,045  
Puerto Rico [Member]      
Goodwill [Line Items]      
Impairment of goodwill     $ 679