Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
$ 132,051
|
$ 118,618
|
$ 248,933
|
$ 213,964
|
| Logistics business | Paraguay | Sale of Products |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
9,265
|
8,810
|
17,690
|
16,822
|
| Contracts of Affreightment ("COA")/ Voyage Contracts | Dry Bulk Vessel Operations |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
5,998
|
9,629
|
14,617
|
19,288
|
| Contracts of Affreightment ("COA")/ Voyage Contracts | Logistics business |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
10,623
|
13,145
|
19,552
|
23,451
|
| Time and bareboat chartering | Dry Bulk Vessel Operations |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
66,427
|
46,430
|
122,161
|
83,725
|
| Time and bareboat chartering | Logistics business |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
17,988
|
23,443
|
36,534
|
41,350
|
| Pooling arrangements | Dry Bulk Vessel Operations |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
0
|
2,792
|
0
|
7,133
|
| Profit Sharing | Dry Bulk Vessel Operations |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
(339)
|
300
|
(205)
|
445
|
| Port Terminal Operations | Logistics business |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
20,201
|
11,895
|
34,591
|
17,609
|
| Storage Fees (dry port) | Logistics business |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
74
|
329
|
341
|
699
|
| Dry Port Terminal Operations | Logistics business |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
923
|
1,198
|
1,530
|
1,854
|
| Liquid Port Terminal Operations | Logistics business | Paraguay |
|
|
|
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
|
|
| Revenue |
$ 860
|
$ 548
|
$ 1,858
|
$ 1,283
|