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Stockholders' Equity (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Aug. 31, 2011
Stock Repurchase Program 2011 [Member]
Dec. 31, 2012
Stock Repurchase Program 2011 [Member]
Dec. 31, 2011
Stock Repurchase Program 2011 [Member]
May 31, 2012
Stock Repurchase Program 2012 [Member]
Dec. 31, 2012
Stock Repurchase Program 2012 [Member]
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares)     500,000 30,000          
Preferred stock, par value (in dollars per share) $ 20                
Preferred stock, voting rights       Each share of the Series A Preferred Stock shall entitle the holder to one thousand votes          
Preferred stock, shares outstanding (in shares) 0 0              
Stock repurchase program, authorized amount         $ 5,000,000     $ 5,000,000  
Stock repurchased during period (in shares)           68,250 322,250   312,527
Stock repurchased during period 4,999,000 4,136,000       900,000 4,100,000   4,100,000
Stock repurchase program, remaining authorized amount           0     900,000
Accumulated other comprehensive income [Abstract]                  
Foreign currency translation adjustments 4,663,000 3,078,000              
Unrecognized postretirement benefit costs (credit) (784,000) 221,000              
Total accumulated other comprehensive income $ 3,879,000 $ 3,299,000