Segment Information - Revenue by Geographic Region (Table) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | $ 517,739 | $ 463,049 | $ 419,782 |
| North America | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 4,248 | 5,513 | 6,218 |
| Europe | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 142,688 | 124,857 | 109,267 |
| Asia | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 135,614 | 91,552 | 73,073 |
| South America | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | 208,751 | 212,616 | 220,336 |
| Other | |||
| Revenues From External Customers And Long Lived Assets [Line Items] | |||
| Revenue by geographic region | $ 26,438 | $ 28,511 | $ 10,888 |