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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 15, 2012
Jun. 30, 2013
Jun. 15, 2012
Stock Options [Member]
        
Stock Incentive Plans (Textuals) [Abstract]        
Stock option and Incentive plan, shares authorized 8,000,000   8,000,000  
Number of Shares Issued or Committed to Issue 3,453,861   3,453,861  
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  
Number of shares, Granted     297,838  
Number of shares, Additional shares from dividends     1,040  
Number of shares, Foreited     (16,934)  
Number of shares, Vested     (400,722)  
Number of shares, Ending Balance 557,333   557,333  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant date fair value, Beginning balance (in dollars per share)     $ 10.10  
Weighted-average grant date fair value, Granted (in dollars per share)     $ 9.17  
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share)     $ 9.30  
Weighted-average grant date fair value, Forfeited     $ 9.65  
Weighted-average grant date fair value, Vested (in dollars per share)     $ 9.94  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 9.74   $ 9.74  
Stock Incentive Plans (Textuals) [Abstract]        
Award vesting period     3 years  
Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date (in shares) 269,117   269,117  
Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date (in shares) 191,877   191,877  
Restricted Stock Awards Expected to Vest Four Years from Balance Sheet Date (in shares) 96,339   96,339  
Unrecognized compensation cost (in dollars) $ 4.5   $ 4.5  
Unrecognized compensation expense related to compensation awards, period for recognition (in months)     25 months  
Compensation expense (in dollars) 0.7 0.8 2.0 1.6
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  
Number of Units, Additional units from dividends     3,630  
Number of shares, Vested     (90,620)  
Number of shares, Ending Balance 171,852   171,852  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant date fair value, Beginning balance (in dollars per share)     $ 11.31  
Weighted-Average Grant Date Fair Value, Additional units from dividends, Weighted Average Grant Date Fair Value     $ 9.69  
Weighted-average grant date fair value, Vested (in dollars per share)     $ 9.86  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 12.04   $ 12.04  
Stock Incentive Plans (Textuals) [Abstract]        
Award vesting period     3 years  
Unrecognized compensation cost (in dollars) 0.6   0.6  
Unrecognized compensation expense related to compensation awards, period for recognition (in months)     17 months  
Compensation expense (in dollars) 0.1 0.2 0.5 0.4
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  
Number of Units, Additional units from dividends     1,618  
Number of shares, Granted     217,949  
Number of shares, Ending Balance 219,567   219,567  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant date fair value, Beginning balance (in dollars per share)     $ 0.00  
Weighted-Average Grant Date Fair Value, Additional units from dividends, Weighted Average Grant Date Fair Value     $ 10.31  
Weighted-average grant date fair value, Granted (in dollars per share)     $ 9.64  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 9.64   $ 9.64  
Stock Incentive Plans (Textuals) [Abstract]        
Award vesting period     3 years  
Unrecognized compensation cost (in dollars) 1.9   1.9  
Unrecognized compensation expense related to compensation awards, period for recognition (in months)     32 months  
Compensation expense (in dollars) $ 0.2   $ 0.2  
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%