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Leases, Schedule of Future Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Operating Leased Assets [Line Items]  
2016 $ 119,529
2017 63,712
2018 35,741
2019 8,548
2020 5,809
Thereafter 13,519
Future minimum lease payments under operating leases 246,858
Marine Equipment [Member] | Tank Barges [Member]  
Operating Leased Assets [Line Items]  
2016 11,751
2017 10,544
2018 8,843
2019 3,856
2020 2,239
Thereafter 0
Future minimum lease payments under operating leases 37,233
Marine Equipment [Member] | Towing Vessels [Member]  
Operating Leased Assets [Line Items]  
2016 100,124
2017 46,362
2018 20,732
2019 317
2020 0
Thereafter 0
Future minimum lease payments under operating leases 167,535
Land Buildings and Equipment [Member]  
Operating Leased Assets [Line Items]  
2016 7,654
2017 6,806
2018 6,166
2019 4,375
2020 3,570
Thereafter 13,519
Future minimum lease payments under operating leases $ 42,090