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Shareholders' Equity (Details) - $ / shares
Apr. 27, 2016
Jan. 28, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]            
Declared quarterly cash dividend   $ 0.18        
Special Dividends Payable, Amount Per Share   $ 0.20        
Dividend Declared [Member]            
Subsequent Event [Line Items]            
Declared quarterly cash dividend $ 0.19          
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