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Common Stock (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2009
Dec. 31, 2016
Dec. 31, 2008
Common Stock [Abstract]      
Common stock authorized by the Board of Directors (in shares) 1,200,000   2,250,000
Maximum percentage of repurchase of common stock 10.00%    
Bank credit agreement to permit share repurchases of common stock $ 15,000,000    
Total purchased shares (in shares) 859,499 0  
Additional estimated shares (in shares)   213,675  
Closing price (in dollars per share)   $ 70.20