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Intangible Assets, net and Intangible Liability, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets, net      
Cost $ 24,050 $ 24,050  
Accumulated amortization (1,505) (1,204)  
Total 22,545 22,846  
Intangible Liability, net      
Cost 4,179 4,179  
Accumulated amortization (610) (554)  
Total 3,569 3,625  
Amortization of intangibles 301 314 $ 199
Amortization of Intangible Liabilities 56 57 $ 57
Intangible Assets      
2018 277    
2019 277    
2020 277    
2021 277    
2022 277    
Thereafter 21,160    
Total 22,545 22,846  
Intangible Liabilities      
2018 57    
2019 57    
2020 57    
2021 57    
2022 57    
Thereafter 3,284    
Total $ 3,569 $ 3,625