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Shareholders' Equity (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dividends        
Cash dividends declared per common share (in dollars per share)   $ 0.15 $ 0.15 $ 0.15
Dividend restriction, base amount   $ 50,000,000    
Dividend restriction, percentage of the net proceeds of all equity issuances made after the closing date of the Credit Facility and Term Loan Facility   100.00%    
Dividend restriction, percentage of the consolidated net income calculated quarterly for the previous four fiscal quarters   50.00%    
Issuance of Common Stock        
Public offering of common stock (in shares) 9.2      
Issue price of common stock (in dollars per share) $ 25.00      
Net proceeds from public offering of common stock 218,816,000   218,816,000  
Commissions paid to underwriters 10,400,000      
Expenses incurred in connection with the offering 800,000      
Stock Repurchase Programs        
Amount available to repurchase shares under stock repurchase program   $ 50,000,000