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Contingencies and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]    
Banker's acceptance drafts, maturity period 6 months  
Banker's acceptance drafts with recourse $ 11,222 $ 4,824