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Other Income / (Expense), Net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Other Nonoperating Income (Expense) [Abstract]        
Foreign currency loss $ (569) $ (1,782) $ (730) $ (1,463)
Impairment of long-term investments 0 (5,881) 0 (5,881)
Interest income 1,153 644 2,210 1,127
Total other income / (expense) $ 584 $ (7,019) $ 1,480 $ (6,217)