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Leases, Schedule of Future Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 86,784
2019 28,453
2020 18,816
2021 15,529
2022 13,581
Thereafter 87,167
Future minimum lease payments under operating leases 250,330
Marine Equipment [Member] | Barges [Member]  
Operating Leased Assets [Line Items]  
2018 8,711
2019 4,573
2020 3,806
2021 1,567
2022 1,567
Thereafter 896
Future minimum lease payments under operating leases 21,120
Marine Equipment [Member] | Towing Vessels [Member]  
Operating Leased Assets [Line Items]  
2018 59,185
2019 8,727
2020 2,578
2021 2,578
2022 2,578
Thereafter 12,889
Future minimum lease payments under operating leases 88,535
Land Buildings and Equipment [Member]  
Operating Leased Assets [Line Items]  
2018 18,888
2019 15,153
2020 12,432
2021 11,384
2022 9,436
Thereafter 73,382
Future minimum lease payments under operating leases $ 140,675