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Schedule II - Valuation and Qualifying Accounts (Details) - Provision for Doubtful Account - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in allowance for doubtful accounts for trade receivables      
Beginning Balance $ 520 $ 535 $ 621
Provision for Bad Debts 871 120 (85)
Chargeoffs (239) (137)  
Foreign Currency Translation   2 (1)
Ending Balance $ 1,152 $ 520 $ 535