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Equity-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
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
SAR's granted to employees   275,625   275,625  
Weighted-average base price   $ 12.15   $ 12.15  
Weighted-average fair value   $ 6.58   $ 6.58  
SARs outstanding   1,576   1,576  
Deferred Stock Units, issued under director plan 9,538 2,297 15,251 5,734  
Equity-Based Compensation (Textual) [Abstract]          
SARs vesting on the first anniversary     25.00%    
Remaining SARs vesting equally each month     75.00%    
Aggregate intrinsic values of the SARs outstanding $ 7.5   $ 7.5   $ 2.1
Restricted stock forfeited 375 0 375 0  
Deferred Stock Units, value     0.3 0.8  
Deferred Stock Units vesting period     1 year 1 year  
Deferred Stock Units, vested   7,500 52,500 39,000  
Subsequent vesting of remaining SARs, period     36 months    
Expense not reflected in the summarized equity-based compensation table 0.2 0.1 0.1 0.1  
Stock Appreciation Rights [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
SARs vesting period     4 years    
SAR's granted to employees 259,625   259,625    
Weighted-average base price $ 9.25   $ 9.25    
Weighted-average fair value $ 4.90   $ 4.90    
SARs, exercised 0 17,188 0 98,057  
Forfeited of SARs 1,598 0 1,598 0  
SARs outstanding 4,405,418 19,998 4,405,418 19,998 4,147,391
Stock Option [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
SAR's granted to employees 0   0    
Stock options, exercised 3,700 3,125 30,500 3,425  
Stock options, expired 600 42,117 8,000 69,117  
Stock options, forfeited 21 0 21 0  
Stock options, outstanding 144,687   144,687   183,208
Aggregate intrinsic value of the stock options, outstanding 0.5   0.5   0.3
Restricted Stock Units (RSUs) [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expense associated with award 0.2     0.2  
Restricted stock vested 62,461   68,711 6,250  
Restricted stock issued and unvested 1,273,672   1,273,672   1,225,785
Restricted Stock Units (RSUs) [Member] | Employees [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted 69,875 66,875   66,875  
Restricted stock awards value 0.6 0.8   0.8  
Restricted stock awards vesting period 4 years 4 years   4 years  
Remaining Restricted stock awards vesting equally each six months 87.50%        
Restricted stock awards vesting on the Nine month anniversary 12.50%        
Restricted Stock Units (RSUs) [Member] | Executives of a Consolidated Subsidiary [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted 28,348 15,035   15,035  
Restricted stock awards value 0.3 0.2   0.2  
Restricted stock awards vesting period   7 years   7 years  
Restricted Stock Units (RSUs) [Member] | Non-Management Directors (Director Plan) [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock awards granted     18,750    
Restricted stock awards value     $ 0.2    
Director Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred Stock Units, issued under director plan     41,250 60,000