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Leases (Schedule of Future Minimum Rental Payments for Operating Leases) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 73,223
2019 31,386
2020 22,260
2021 21,473
2022 11,680
Thereafter 21,796
Total 181,818
Mining Equipment  
Operating Leased Assets [Line Items]  
2018 2,992
2019 1,701
2020 627
2021 0
2022 0
Thereafter 0
Total $ 5,320