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Segment Information - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Segment
Sep. 30, 2016
USD ($)
Segment Reporting [Abstract]        
Number of operating segments (in segments) | Segment     2  
Restructuring charges | $ $ 0 $ 4 $ 0 $ 10,545