Segment Information - Revenue by Geographic Region (Table) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | $ 463,049 | $ 419,782 | $ 480,820 |
| North America | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 5,513 | 6,218 | 22,317 |
| Europe | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 124,857 | 109,267 | 109,347 |
| Asia | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 91,552 | 73,073 | 87,658 |
| South America | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 212,616 | 220,336 | 253,746 |
| Other | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | $ 28,511 | $ 10,888 | $ 7,752 |