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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 25, 2016
Sep. 30, 2002
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]          
Dividends paid to shareholders     $ (5,117) $ (4,750) $ (4,215)
Cash dividends paid (USD per share)     $ 0.74 $ 0.70 $ 0.64
Percentage of common stock authorized for repurchase   5.00%      
Remaining shares available under stock repurchase program (shares)     227,242    
Shares repurchased (shares)     0 0  
Subsequent Event          
Class of Stock [Line Items]          
Cash dividends declared (USD per share) $ 0.19