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Shareholders' Equity - Schedule of Stock Options Expected To Vest, Stock Options Exercisable, and Unvested Restricted Share Awards Expected To Vest (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted Average Exercise Price, Number of stock options expected to vest $ 20.73    
Weighted Average Exercise Price, Total stock options exercisable - December 31, 2017 $ 15.40 $ 15.22 $ 14.40
Number of stock options expected to vest 2,782,868    
Number of Restricted Shares expected to vest 183,629    
Weighted Average Remaining Life (Years), Number of stock options expected to vest 4 years 10 months 24 days    
Weighted Average Remaining Life (Years), Total stock options exercisable - December 31, 2017 3 years 9 months 18 days    
Employee Stock Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of stock options expected to vest 2,782,868    
Total stock options exercisable - December 31, 2017 917,592    
Unrecognized compensation cost - December 31, 2017 $ 8,833    
Weighted average years over which unrecognized compensation cost will be recognized 1 year 10 months 24 days    
RSAs      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted average years over which unrecognized compensation cost will be recognized 3 years 3 months 18 days    
Number of Restricted Shares expected to vest 183,629    
Unrecognized compensation cost - December 31, 2017 $ 4,745