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Share-based Compensation Plans - Schedule of Share-based Compensation (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Share-based compensation expense $ 1,012 $ 1,493
Unrecognized share-based compensation $ 11,054 $ 11,054