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Stock Incentive Plans (Details) (USD $)
 0 Months Ended 12 Months Ended
May 03, 2012
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2010
Restricted Stock [Member]
Dec. 31, 2012
Market Stock Units [Member]
D
Dec. 31, 2011
Market Stock Units [Member]
Dec. 31, 2010
Market Stock Units [Member]
Summary of Restricted Stock Awards                
Number of shares, Start Balance     1,010,127 1,548,698 1,719,376 161,575 84,854 0
Weighted-average grant date fair value, Beginning balance (in dollars per share)     $ 6.97 $ 5.49 $ 4.76 $ 11.45 $ 9.87 $ 0.00
Number of shares, Granted     365,599 308,486 356,964 89,990 72,599 84,854
Weighted-average grant date fair value, Granted (in dollars per share)     $ 9.84 $ 11.54 $ 8.41 $ 11.14 $ 13.43 $ 9.87
Number of shares, Additional shares from dividends     8,507 18,302 46,206 7,277 4,122  
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share)     $ 10.07 $ 9.23 $ 9.57 $ 10.18 $ 9.23  
Number of shares, Forfeited     (11,563) (17,560)        
Weighted-average grant date fair value, Forfeited (in dollars per share)     $ 10.05 $ 7.02        
Number of shares, Vested     (696,559) (847,799) (573,848)      
Weighted-average grant date fair value, Vested (in dollars per share)     $ 5.39 $ 6.01 $ 5.19      
Number of shares, Ending Balance     676,111 1,010,127 1,548,698 258,842 161,575 84,854
Weighted-average grant date fair value, Ending balance (in dollars per share)     $ 10.10 $ 6.97 $ 5.49 $ 11.31 $ 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)     338,723          
Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Two Years from Balance Sheet Date (in shares)     217,552          
Share Based Compensation Arrangement by Share Based Payment Award Restricted Stock Awards Expected to Vest Three Years from Balance Sheet Date (in shares)     119,836          
Summary of Stock Appreciation Rights and Dividend Equivalent Rights                
Share based payment, vesting period (years)     3 years     3 years    
Stock Incentive Plans (Textuals) [Abstract]                
Stock option and Incentive plan, shares authorized   8,000,000            
Number of Shares Issued or Committed to Issue   3,228,333            
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 12,104              
Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued (in dollars) $ 325,000              
Unrecognized compensation cost (in dollars)     4,000,000     1,100,000    
Unrecognized compensation expense related to compensation awards, period for recognition (in months)     21 months     21 months    
Compensation expense (in dollars)     $ 3,300,000 $ 3,600,000 $ 3,200,000 $ 900,000 $ 600,000 $ 200,000
Deferred Compensation Arrangement with Individual, Shares Issued 18,156              
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%