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Equity (Details) (USD $)
 1 Months Ended 12 Months Ended
Feb. 28, 2013
Jul. 31, 2012
Feb. 29, 2012
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
May 16, 2012
May 31, 2005
Common Stock                
Common stock quarterly dividend per share, after increase (in dollars per share) $ 0.30 $ 0.25 $ 0.15 $ 0.80 $ 0.48 $ 0.40    
Common stock quarterly dividend per share, before increase (in dollars per share)     $ 0.12          
Number of common stock share authorized before amendment to Restated Articles of Incorporation             100,000,000  
Number of common stock shares authorized       200,000,000 100,000,000   200,000,000  
Votes per share of common stock       1        
Share Repurchase Program                
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase program               12,000,000
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares)       7,883,033 7,883,033      
Preferred Stock                
Authorized preferred stock       5,000,000 5,000,000      
Minimum number of series in which preferred shares may be issued       1