Annual report pursuant to Section 13 and 15(d)

Permit and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)

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Permit and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total $ 1,549 $ 1,838
Intangible Assets [Member]    
2018 336  
2019 254  
2020 218  
2021 198  
2022 173  
Total $ 1,179