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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net income / (loss) $ 3,299 $ (254) $ 10,821 $ 32,327
Foreign currency translation loss (1,027) (4,181) (982) (3,106)
Other comprehensive loss (1,027) (4,181) (982) (3,106)
Comprehensive income / (loss) $ 2,272 $ (4,435) $ 9,839 $ 29,221