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Inventories - Impairment allowance roll forward (Details) - Inventory Valuation Reserve - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Movement In Valuation Allowances And Reserves1 [Roll Forward]    
Beginning Balance $ 1,717 $ 4,436
Currency translation (48) 375
Addition 1,276 2,826
Utilization (342) (1,920)
Release (530) (737)
Ending Balance $ 2,073 $ 4,980