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Employee Benefit Plans Phantom Stock (Details) (Phantom Stock Plan, USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
May 31, 2011
payment
Dec. 31, 2013
Dec. 31, 2012
Dec. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of installment payments 2      
Reversal of contingency related to a long term employee incentive plan   $ 2.4    
Phantom stock compensation expense   (1.6) (0.3) (1.3)
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom Stock Expected Future Payout   1.3    
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom Stock Expected Future Payout   $ 1.1    
Phantom Share Units (PSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom stock shares issued in period   1,000   386
Phantom Share Units (PSUs) | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom stock shares authorized   5,000