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Stock Incentive Plans (Details) (USD $)
 8 Months Ended 12 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2011
Restricted Stock [Member]
months
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2009
Restricted Stock [Member]
Dec. 31, 2010
Market Stock Units [Member]
Dec. 31, 2011
Market Stock Units [Member]
months
days
Dec. 31, 2010
Market Stock Units [Member]
Dec. 31, 2004
Deferred Stock Awards [Member]
Summary of Restricted Stock Awards                  
Number of shares, Start Balance     1,548,698 1,719,376 605,809   84,854 0  
Weighted-average grant date fair value, Beginning balance (in dollars per share)     $ 5.49 $ 4.76 $ 13.02   $ 9.87 $ 0.00  
Number of shares, Granted     308,486 356,964 1,517,435   72,599 84,854  
Weighted-average grant date fair value, Granted (in dollars per share)     $ 11.54 $ 8.41 $ 2.82   $ 13.43 $ 9.87  
Number of shares, Additional shares from dividends     18,302 46,206     4,122    
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share)     $ 9.23 $ 9.57     $ 9.23    
Number of shares, Forfeited     (17,560)   (7,184)        
Weighted-average grant date fair value, Forfeited (in dollars per share)     $ 7.02   $ 14.61        
Number of shares, Vested     (847,799) (573,848) (396,684)        
Weighted-average grant date fair value, Vested (in dollars per share)     $ 6.01 $ 5.19 $ 9.77        
Number of shares, Ending Balance     1,010,127 1,548,698 1,719,376 84,854 161,575 84,854  
Weighted-average grant date fair value, Ending balance (in dollars per share)     $ 6.97 $ 5.49 $ 4.76 $ 9.87 $ 11.45 $ 9.87  
Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest One Year from Balance Sheet (in shares)     691,862            
Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date (in shares)     218,967            
Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date (in shares)     99,298            
Summary of Stock Appreciation Rights and Dividend Equivalent Rights                  
Share based payment, vesting period (years)     3 years       3 years   5 years
Stock Incentive Plans (Textuals) [Abstract]                  
Stock option and Incentive plan, shares authorized   8,000,000              
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Issued or Committed to Issue   3,110,661              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 11,872                
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued (in dollars) $ 325,000                
Unrecognized compensation cost (in dollars)     3,800,000       1,000,000    
Unrecognized compensation expense related to compensation awards, period for recognition (in months)     21       26    
Compensation expense (in dollars)     $ 3,600,000 $ 3,200,000 $ 5,700,000 $ 100,000 $ 600,000 $ 200,000  
Deferred Compensation Arrangement with Individual, Shares Issued 17,808                
Number of Trading Days of Average Closing Price of Common Stock on Vesting Date used to Calculate Total Shareholder Return (in days)             30    
Number Of Trading Days Of Average Closing Price Of Common Stock On Grant Date Used To Calculate Total Stockholder Return (in days)             30    
Threshold Percentage Of No Payout If Stockholder Return Is Less Then Target Return (as a percent)             50.00%    
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent)             150.00%