Summary of Significant Accounting Policies - Provisions, Segment Reporting and Revenue Recognition (Details)
$ in Thousands |
1 Months Ended |
12 Months Ended |
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Provision for loss making voyages in progress |
$ 1,604
|
$ 1,604
|
$ 2,631
|
|
| Number of Reportable Segments |
|
3
|
|
|
| Revenue |
|
$ 517,739
|
463,049
|
$ 419,782
|
| Dry Bulk Vessel Operations | Contracts of Affreightment ("COA")/ Voyage Contracts |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
19,121
|
38,273
|
29,857
|
| Dry Bulk Vessel Operations | Time and bareboat chartering |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
278,591
|
199,945
|
153,858
|
| Dry Bulk Vessel Operations | Pooling arrangements |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
0
|
8,025
|
15,007
|
| Dry Bulk Vessel Operations | Profit-sharing |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
(52)
|
3,205
|
(2,530)
|
| Logistics business | Contracts of Affreightment ("COA")/ Voyage Contracts |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
35,623
|
42,455
|
62,603
|
| Logistics business | Time and bareboat chartering |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
72,689
|
84,063
|
153,858
|
| Logistics business | Port terminal operations |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
58,552
|
43,984
|
29,056
|
| Logistics business | Storage fees (dry port) |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
882
|
1,974
|
446
|
| Logistics business | Dry port terminal operations |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
3,136
|
4,497
|
3,373
|
| Logistics business | Liquid port terminal operations | Paraguay |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
3,739
|
2,841
|
3,059
|
| Containers business | Time and bareboat chartering |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
$ 12,053
|
|
|
|
| Sale of Products | Logistics business | Paraguay |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
|
$ 32,508
|
$ 32,572
|
$ 30,118
|