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Equity-Based Compensation Plans (Details 2) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 in Period (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 in Period (158,300)      
Number of Share Units, Ending balance 0      
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 200,450.00      
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 (6,650.00)      
Change in performance expectations, weighted average $ 26.58      
Number of Performance Share Units Issued in Period (192,000)      
Weighted Average Exercise Price, Issued $ 26.29      
Number of Share Units, Ending balance 0      
Weighted Average Exercise Price, Ending balance $ 0.00      
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%  
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%