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Segment Information (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Segment Reporting Information [Line Items]        
Number of Co-CEOs | item 2   2  
Net operating revenue $ 33,526 $ 28,123 $ 101,803 $ 88,790
Number of reportable segments | item     3  
United States [Member]        
Segment Reporting Information [Line Items]        
Net operating revenue 7,958 7,252 $ 21,960 20,456
Corporate and Other [Member] | International Waters [Member]        
Segment Reporting Information [Line Items]        
Net operating revenue 800 2,100 3,200 5,400
Corporate and Other [Member] | Aruba [Member]        
Segment Reporting Information [Line Items]        
Net operating revenue 100 $ 100 300 $ 300
Corporate and Other [Member] | Argentina [Member]        
Segment Reporting Information [Line Items]        
Net operating revenue $ 100   200  
Termination of Concession agreements [Member] | Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Net operating revenue     $ 3,400