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Stock Incentive Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option and Incentive plan, shares authorized 8,000,000    
Number of Shares Issued or Committed to Issue 3,480,779    
Restricted Stock [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based payment, vesting period (years) 3 years    
Summary of Restricted Stock Awards      
Number of shares, Start Balance 676,111 1,010,127 1,548,698
Number of shares, Granted 323,526 365,599 308,486
Number of shares, Additional shares from dividends 1,040 8,507 18,302
Number of shares, Forfeited (16,934) (11,563) (17,560)
Number of shares, Vested (400,722) (696,559) (847,799)
Number of shares, Ending Balance 583,021 676,111 1,010,127
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 10.10 $ 6.97 $ 5.49
Weighted-average grant date fair value, Granted (in dollars per share) $ 9.33 $ 9.84 $ 11.54
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) $ 9.30 $ 10.07 $ 9.23
Weighted-average grant date fair value, Forfeited (in dollars per share) $ 9.65 $ 10.05 $ 7.02
Weighted-average grant date fair value, Vested (in dollars per share) $ 9.94 $ 5.39 $ 6.01
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 9.80 $ 10.10 $ 6.97
Summary of Stock Appreciation Rights and Dividend Equivalent Rights      
Expected to vest one year from balance sheet date 270,440    
Expected to vest two years from balance sheet date 200,440    
Expected to vest three years from balance sheet date 104,901    
Expected to vest four years from balance sheet date 7,240    
Unrecognized compensation cost (in dollars) $ 3.4    
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 22 months    
Compensation expense (in dollars) 3.4 3.3 3.6
Restricted Stock [Member] | President and Chief Operating Officer [Member]
      
Summary of Stock Appreciation Rights and Dividend Equivalent Rights      
Accelerated vesting expense 0.7    
Market Stock Units [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based payment, vesting period (years) 3 years    
Summary of Restricted Stock Awards      
Number of shares, Start Balance 258,842 161,575 84,854
Number of shares, Granted   89,990 72,599
Number of shares, Additional shares from dividends 6,452 7,277 4,122
Number of shares, Vested (90,620)    
Number of shares, Ending Balance 174,674 258,842 161,575
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 11.31 $ 11.45 $ 9.87
Weighted-average grant date fair value, Granted (in dollars per share)   $ 11.14 $ 13.43
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) $ 10.00 $ 10.18 $ 9.23
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) $ 12.01 $ 11.31 $ 11.45
Summary of Stock Appreciation Rights and Dividend Equivalent Rights      
Unrecognized compensation cost (in dollars) 0.3    
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 13 months    
Compensation expense (in dollars) 0.8 0.9 0.6
Stock Incentive Plans (Textuals) [Abstract]      
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%    
Market Stock Units [Member] | President and Chief Operating Officer [Member]
      
Summary of Stock Appreciation Rights and Dividend Equivalent Rights      
Accelerated vesting expense 0.2    
Market Stock Units [Member] | March 2011 Award [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Volatility 64.00%    
Risk-Free Rate 1.20%    
Fair Value Grant Date (in dollars per share) $ 13.43    
Market Stock Units [Member] | March 2012 Award [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Volatility 62.00%    
Risk-Free Rate 0.43%    
Fair Value Grant Date (in dollars per share) $ 11.14    
Performance Stock Units [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based payment, vesting period (years) 3 years    
Summary of Restricted Stock Awards      
Number of shares, Start Balance 0    
Number of shares, Granted 217,949    
Number of shares, Additional shares from dividends 5,227    
Number of shares, Vested 0    
Number of shares, Ending Balance 223,176    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, Beginning balance (in dollars per share) $ 0.00    
Weighted-average grant date fair value, Granted (in dollars per share) $ 9.64    
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) $ 10.37    
Weighted-average grant date fair value, Vested (in dollars per share) $ 0.00    
Weighted-average grant date fair value, Ending balance (in dollars per share) $ 9.66    
Summary of Stock Appreciation Rights and Dividend Equivalent Rights      
Unrecognized compensation cost (in dollars) 1.5    
Unrecognized compensation expense related to compensation awards, period for recognition (in months) 26 months    
Compensation expense (in dollars) $ 0.6    
Stock Incentive Plans (Textuals) [Abstract]      
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) 150.00%    
Performance period 3 years    
Performance Stock Units [Member] | March 2013 Award [Member]
      
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 Grant Date (in dollars per share) $ 9.55    
Performance Stock Units [Member] | May 2013 Award [Member]
      
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 Grant Date (in dollars per share) $ 10.41