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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2008
Class of Stock [Line Items]      
Common stock, shares authorized (in shares) 195,000,000 195,000,000  
Treasury stock acquired, Aggregate purchase price $ 45,891    
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000  
Series A Convertible Preferred Stock, shares issued (in shares) 80,718 82,515  
Series A Convertible Preferred Stock, par value (in dollars per share) $ 0.01 0.01  
Series A Convertible Preferred Stock [Abstract]      
Shares outstanding, beginning of period (in shares) 82,515    
Total shares outstanding, end of period (in shares) 80,718    
Common Stock [Member]
      
Class of Stock [Line Items]      
Common stock, shares authorized (in shares) 195,000,000    
Stock repurchase program, Number of shares authorized to be repurchased 60,000    
Number of shares Treasury stock acquired (in shares) 4,386,521    
Treasury stock acquired, Aggregate purchase price 45,891    
Stock repurchase program, Remaining authorized repurchase amount $ 14,109    
Preferred Stock [Member]
      
Class of Stock [Line Items]      
Preferred stock, shares authorized (in shares) 5,000,000    
Series A Convertible Preferred Stock [Member]
      
Class of Stock [Line Items]      
Series A Convertible Preferred Stock, shares issued (in shares)     160,000
Series A Convertible Preferred Stock, par value (in dollars per share) $ 0.01    
Series A Convertible Preferred Stock [Abstract]      
Shares outstanding, beginning of period (in shares) 82,515 83,452  
Automatic conversions during the year (in shares) (1,797) (937)  
Total shares outstanding, end of period (in shares) 80,718 82,515  
Series A Convertible Preferred Stock, liquidation preference per share (in dollars per share) $ 0.01    
Series A Convertible Preferred Stock, Conversion ratio (in shares) 100