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Shareholders' Equity (Details) - $ / shares
Oct. 29, 2015
Jul. 23, 2015
Apr. 22, 2015
Jan. 29, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Subsequent Event [Line Items]                
Declared quarterly cash dividend   $ 0.18 $ 0.18 $ 0.16        
Special Dividends Payable, Amount Per Share   $ 0.16 $ 0.16 $ 0.14        
Dividend Declared [Member]                
Subsequent Event [Line Items]                
Declared quarterly cash dividend $ 0.18              
Special Dividends Payable, Amount Per Share $ 0.18              
Preferred Stock [Member]                
Subsequent Event [Line Items]                
Stock Issued During Period, Shares, New Issues         8,782 8,782 8,782 8,782