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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 23, 2012
Stock Options [Member]
    
Stock Incentive Plans (Textuals) [Abstract]    
Stock option and Incentive plan, shares authorized 8,000,000  
Number of Shares Issued or Committed to Issue 3,430,691  
Restricted Stock [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Number of shares, Beginning Balance 676,111  
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 10.10  
Number of shares, Granted 269,826  
Weighted-average grant date fair value, Granted (in dollars per share) $ 9.08  
Number of shares, Additional shares from dividends 1,040  
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) $ 9.30  
Number of shares, Foreited (1,514)  
Weighted-average grant date fair value, Forfeited $ 9.98  
Number of shares, Vested (339,069)  
Weighted-average grant date fair value, Vested (in dollars per share) $ 9.86  
Number of shares, Ending Balance 606,394  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 9.78  
Restricted Stock Awards Expected to Vest One Year from Balance Sheet (in shares) 61,510  
Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date (in shares) 267,098  
Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date (in shares) 187,846  
Restricted Stock Awards Expected to Vest Four Years from Balance Sheet Date (in shares) 89,940  
Stock Incentive Plans (Textuals) [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Unrecognized compensation cost (in dollars) $ 5.1  
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 27 months  
Compensation expense (in dollars) 1.4 0.8
Compensation Expense Related to Accelerated Vesting of Awards in Connection with Retirment 0.7  
Market Stock Units [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Number of shares, Beginning Balance 258,842  
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 11.31  
Number of Units, Additional units from dividends 2,225  
Weighted-Average Grant Date Fair Value, Additional units from dividends, Weighted Average Grant Date Fair Value $ 9.30  
Number of shares, Vested (90,620)  
Weighted-average grant date fair value, Vested (in dollars per share) $ 9.87  
Number of shares, Ending Balance 170,447  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 12.05  
Stock Incentive Plans (Textuals) [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Unrecognized compensation cost (in dollars) 0.7  
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 19 months  
Compensation expense (in dollars) 0.4 0.2
Compensation Expense Related to Accelerated Vesting of Awards in Connection with Retirment 0.2  
Performance Stock Units [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Number of shares, Beginning Balance 0  
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 0.00  
Number of shares, Granted 219,895  
Weighted-average grant date fair value, Granted (in dollars per share) $ 9.55  
Number of shares, Ending Balance 219,895  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 9.55  
Stock Incentive Plans (Textuals) [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Unrecognized compensation cost (in dollars) 2.0  
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 35 months  
Compensation expense (in dollars) $ 0.1  
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) 150.00%  
No Payout of Shares of Common Stock if Total Stockholder Return Falls Below Threshold 30.00%  
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award, Percentile of Total Stockholder Return of Peer Group 75.00%