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Intangible Assets Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 1997
Finite-Lived Intangible Assets [Line Items]        
Intangible assets $ 22,675 $ 19,333    
Net intangible assets 15,558 13,781    
Amortization of Intangible Assets 453 364 $ 354  
Future Amortization of Intangible Assets        
2016 453      
2017 453      
2018 453      
2019 453      
2020 453      
Concession Fees [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets 6,800 6,800    
Accumulated amortization of intangible assets 4,964 4,692    
Other Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets 15,875 12,533    
Accumulated amortization of intangible assets 2,153 $ 860    
Service Agreements [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets 12,059      
Useful life of intangible assets       25 years
Infrastructure [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets 2,352      
Contractual Rights [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets 1,040      
Other Miscellaneous Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets $ 424      
Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Useful life of intangible assets 5 years      
Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Useful life of intangible assets 70 years