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Equity-Based Compensation Plans (Details 2) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of performance share unit        
Change in performance expectations, weighted average $ 26.58      
Performance Shares 2010 Award [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite Service Period       3 years
Percent allocated to performance year one 33.00%      
Percent allocated to performance year two 33.00%      
Percent allocated to performance year three 33.00%      
Performance percent target achieved year one       150.00%
Performance percent target achieved year two     150.00%  
Performance percent target achieved year three   0.00%    
Summary of performance share unit        
Number of Shares, Beginning Balance 33,700      
Number of Performance Share Units, Cancelled 0      
Change in performance expectations 0      
Number of Performance Share Units, Issued (33,700)      
Number of Share Units, Ending Balance 0 33,700    
Performance Shares 2011 Award [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite Service Period     3 years  
Percent allocated to performance year one 90.00%      
Percent allocated to performance year three 10.00%      
Performance percent target achieved year one     200.00%  
Performance percent target achieved year three 0.00%      
Summary of performance share unit        
Number of Shares, Beginning Balance 166,750      
Number of Performance Share Units, Cancelled (1,800)      
Change in performance expectations (6,650)      
Number of Performance Share Units, Issued 0      
Number of Share Units, Ending Balance 158,300      
Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Requisite Service Period 3 years      
Summary of performance share unit        
Number of Shares, Beginning Balance 200,450      
Weighted Average Exercise Price, Beginning Balance $ 26.31      
Number of Performance Share Units, Cancelled (1,800)      
Weighted Average Exercise Price, Cancelled $ 26.67      
Change in performance expectations (6,650)      
Number of Performance Share Units, Issued (33,700)      
Weighted Average Exercise Price, Issued $ 25.61      
Number of Share Units, Ending Balance 158,300      
Weighted Average Exercise Price, Ending Balance $ 26.58      
Maximum [Member] | Performance Shares 2010 Award [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation Arrangement by Share Based Payment Award Equity Instrument Other Than Option Stock Issuance Percentage Multiplier       150.00%
Maximum [Member] | Performance Shares 2011 Award [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation Arrangement by Share Based Payment Award Equity Instrument Other Than Option Stock Issuance Percentage Multiplier     200.00%  
Minimum [Member] | Performance Shares 2010 Award [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation Arrangement by Share Based Payment Award Equity Instrument Other Than Option Stock Issuance Percentage Multiplier       0.00%
Minimum [Member] | Performance Shares 2011 Award [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share Based Compensation Arrangement by Share Based Payment Award Equity Instrument Other Than Option Stock Issuance Percentage Multiplier     0.00%