XML 59 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
Trade Receivables - Allowance for Doubtful Accounts Rollforward (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at January 1 $ (11,598) $ (6,264)
Allowance for doubtful accounts (7,849) (7,733)
Reversal of provision 3,378 2,760
Currency translation adjustment (651) (10)
Balance at September 30 $ (16,720) $ (11,247)