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Share-Based Compensation (Details) - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Restricted Stock Units [Member]    
Share-Based Compensation [Line Items]    
Units granted 483,387 321,500
Weighted-average per share prices $ 19.14 $ 23.07
Stock Options [Member]    
Share-Based Compensation [Line Items]    
Stock options awarded 274,000 259,000
Weighted-average exercise prices $ 16.20 $ 16.07
Unrestricted Stock Units [Member]    
Share-Based Compensation [Line Items]    
Units granted 64,603 68,160
Weighted-average per share prices $ 21.67 $ 21.93