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Leases, Schedule of Future Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 106,395
2018 40,299
2019 13,724
2020 11,321
2021 8,581
Thereafter 76,864
Future minimum lease payments under operating leases 257,184
Marine Equipment [Member] | Tank Barges [Member]  
Operating Leased Assets [Line Items]  
2017 10,419
2018 8,718
2019 4,581
2020 3,813
2021 1,574
Thereafter 2,474
Future minimum lease payments under operating leases 31,579
Marine Equipment [Member] | Towing Vessels [Member]  
Operating Leased Assets [Line Items]  
2017 83,949
2018 20,532
2019 314
2020 0
2021 0
Thereafter 0
Future minimum lease payments under operating leases 104,795
Land Buildings and Equipment [Member]  
Operating Leased Assets [Line Items]  
2017 12,027
2018 11,049
2019 8,829
2020 7,508
2021 7,007
Thereafter 74,390
Future minimum lease payments under operating leases $ 120,810