Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Feb. 07, 2014
Shareholders' Equity [Line Items]            
Dividends per share (in dollars per share) $ 0.12       $ 0.12  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           2,000,000
Stock Repurchase Program Number Of Shares Repurchased 232,944          
Stock Repurchased and Retired During Period, In Total Dollars $ 9,995,000       $ 0  
Stock repurchased, common stock acquired, average cost per share $ 42.91          
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 462,673          
Common Stock [Member]            
Shareholders' Equity [Line Items]            
Dividends per share (in dollars per share) $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.12