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Stock-Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-Based Compensation (Textual) [Abstract]        
Total of performance units were outstanding and fully vested   154,264   154,264
Selling, general and administrative expenses $ 1.2 $ 1.3 $ 2.6 $ 2.2
Unrecognized stock-based compensation expense related to stock options 13.0   13.0  
Weighted-average period for recognizing stock compensation expense     2 years  
Maximum [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of shares reserved for issuance under the 2008 EIP 7,600,000   7,600,000  
Minimum [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of shares reserved for issuance under the 2008 EIP 2,200,000   2,200,000  
2006 Management Incentive Plan [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Grant date fair value awards     $ 1.2  
Stock options vesting period     3 years  
Percentage of performance units     60.00%  
Percentage of fair market value     40.00%  
Employee [Member] | 2008 Equity Incentive Plan [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Stock options vesting period     3 years  
Director [Member] | 2008 Equity Incentive Plan [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Stock options vesting period     1 year  
Restricted Stock and Restricted Stock Units [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Stock options award vesting right     vest in equal annual increments over the vesting period  
Restricted Stock and Restricted Stock Units [Member] | Employee [Member] | 2008 Equity Incentive Plan [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Stock options vesting period     3 years  
Restricted Stock and Restricted Stock Units [Member] | Director [Member] | 2008 Equity Incentive Plan [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Stock options vesting period     1 year  
Stock Options [Member] | 2008 Equity Incentive Plan [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Stock options award vesting right     vest in equal annual increments over the vesting period  
Stock options vesting period     7 years