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Stockholders' Equity (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Preferred Stock [Member]
Dec. 31, 2013
Series A Preferred Stock [Member]
May 31, 2012
Stock Repurchase Program 2012 [Member]
Dec. 31, 2013
Stock Repurchase Program 2012 [Member]
Dec. 31, 2012
Stock Repurchase Program 2012 [Member]
Dec. 31, 2013
Stock Repurchase Program 2013 [Member]
Feb. 28, 2014
Stock Repurchase Program 2013 [Member]
Subsequent Event [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     $ 6,000,000 $ 10,000,000
Stock repurchased during period (in shares)             30,601 312,527 179,372.0  
Stock repurchased during period 6,864,000 4,999,000 4,136,000       900,000 4,100,000 6,000,000  
Stock repurchase program, remaining authorized amount             $ 0   $ 0