Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies, Environmental Liabilities, Future Payments (Details)

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Commitments and Contingencies, Environmental Liabilities, Future Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Year ending December 31,    
2017 $ 3,909  
2018 3,577  
2019 2,756  
2020 3,201  
2021 2,788  
2022 and thereafter 37,850  
Discounted environmental liabilities, gross 54,081  
Less: Discount applied 10,400  
Discounted environmental liabilities $ 43,681 $ 43,526