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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Incentive Plans (Textuals) [Abstract]    
Performance period 3 years  
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) 150.00%  
March 3, 2013
    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Volatility 39.20%  
Risk-Free Rate 0.36%  
Fair Value at Grant Date $ 9.55  
May 15, 2013
    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Volatility 37.90%  
Risk-Free Rate 0.40%  
Fair Value at Grant Date $ 10.41  
March 3, 2014
    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Volatility 33.50%  
Risk-Free Rate 0.66%  
Fair Value at Grant Date $ 12.77  
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 3,625,877  
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 583,021  
Number of shares, Granted 221,240  
Number of shares, Additional shares from dividends 0  
Number of shares, Forfeited 0  
Number of shares, Vested (270,440)  
Number of shares, Ending Balance 533,821  
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) $ 9.80  
Weighted-average grant date fair value, Granted (in dollars per share) $ 12.43  
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) $ 0.00  
Weighted-average grant date fair value, Forfeited $ 0.00  
Weighted-average grant date fair value, Vested (in dollars per share) $ 10.10  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 10.74  
Stock Incentive Plans (Textuals) [Abstract]    
Award vesting period 3 years  
Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date (in shares) 274,187  
Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date (in shares) 178,648  
Restricted Stock Awards Expected to Vest Four Years from Balance Sheet Date (in shares) 80,986  
Unrecognized compensation cost (in dollars) $ 5.5  
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 28 months  
Compensation expense (in dollars) 0.7 1.4
Restricted Stock [Member] | Chief Operating Officer [Member]
    
Stock Incentive Plans (Textuals) [Abstract]    
Compensation Expense Related to Accelerated Vesting of Awards in Connection with Retirement   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, Ending Balance 95,915  
Stock Incentive Plans (Textuals) [Abstract]    
Award vesting period 3 years  
Unrecognized compensation cost (in dollars) 0.2  
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 11 months  
Compensation expense (in dollars) 0.1 0.4
Market Stock Units [Member] | Chief Operating Officer [Member]
    
Stock Incentive Plans (Textuals) [Abstract]    
Compensation Expense Related to Accelerated Vesting of Awards in Connection with Retirement   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 223,176  
Number of Units, Additional units from dividends 1,636  
Number of shares, Granted 170,321  
Number of shares, Ending Balance 395,133  
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) $ 9.66  
Weighted-Average Grant Date Fair Value, Additional units from dividends, Weighted Average Grant Date Fair Value $ 11.60  
Weighted-average grant date fair value, Granted (in dollars per share) $ 12.77  
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 11.00  
Stock Incentive Plans (Textuals) [Abstract]    
Unrecognized compensation cost (in dollars) 3.5  
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 30 months  
Compensation expense (in dollars) $ 0.2 $ 0.1