Summary of Significant Accounting Policies - Revenues per Category (Table) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
$ 147,189
|
$ 132,051
|
$ 287,469
|
$ 248,933
|
| Dry Bulk Vessel Operations | COA/Voyage revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
0
|
5,998
|
0
|
14,617
|
| Dry Bulk Vessel Operations | Time chartering revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
52,856
|
66,427
|
105,521
|
122,161
|
| Dry Bulk Vessel Operations | Profit sharing results |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
0
|
(338)
|
0
|
(205)
|
| Logistics Business | COA/Voyage revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
15,366
|
10,623
|
27,794
|
19,552
|
| Logistics Business | Time chartering revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
20,661
|
17,988
|
38,615
|
36,534
|
| Logistics Business | Port terminal revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
19,683
|
20,201
|
36,657
|
34,591
|
| Logistics Business | Storage fees (dry port) revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
437
|
74
|
896
|
341
|
| Logistics Business | Dockage revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
1,083
|
923
|
1,603
|
1,530
|
| Logistics Business | Liquid port terminal revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
932
|
860
|
2,159
|
1,858
|
| Logistics Business | Sale of products revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
2,097
|
$ 9,265
|
8,156
|
$ 17,690
|
| Containers Business | Time chartering revenue |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
$ 33,678
|
|
$ 65,510
|
|