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Shareholders' Equity (Details) (USD $)
 1 Months Ended 12 Months Ended
Oct. 31, 2008
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dividends        
Cash dividends declared (in dollars per share)   $ 0.15 $ 0.15 $ 0.15
Dividend restriction, base amount   $ 50,000,000    
Dividend restriction, percentage of the cumulative consolidated net income calculated quarterly for each fiscal quarters   50.00%    
Dividend restriction, percentage of the net proceeds of all equity issuances made after October 2013   100.00%    
Stock Repurchase Programs        
Authorized common stock repurchase amount 50,000,000      
Shares repurchased   926,000    
Amount of shares repurchased   35,000,000    
Amount available to repurchase shares under stock repurchase program   $ 15,000,000