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Long-term Equity-based Compensation Plans Schedule of Nonvested Restricted Stock Units Activity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 6 Months Ended 0 Months Ended 36 Months Ended
May 02, 2013
Jun. 30, 2013
Jun. 30, 2013
Performance Based Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2013
Time Vested Restricted Stock [Member]
Jun. 30, 2013
Performance Period, 2013 to 2015 [Member]
Performance Based Restricted Stock [Member]
Jun. 30, 2013
Performance Period, 2012 to 2014 [Member]
Performance Based Restricted Stock [Member]
Jun. 30, 2013
Performance Period, 2011 to 2013 [Member]
Performance Based Restricted Stock [Member]
Feb. 02, 2013
Performance Period, 2010 to 2012 [Member]
Performance Based Restricted Stock [Member]
Dec. 31, 2012
Performance Period, 2010 to 2012 [Member]
Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock, Nonvested at Beginning of Year, Number     187,075     126,349          
Restricted Stock, Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value     $ 36.70     $ 26.19          
Restricted Stock, Grants in Period     70,675     71,625          
Restricted Stock, Weighted Average Grant Date Fair Value     $ 42.12     $ 29.95          
Restricted Stock, Vested in Period     (53,118)     (17,000)          
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value     $ 33.14     $ 15.24          
Restricted Stock, Forfeited in Period     (20,257)     (22,066)          
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value     $ 38.80     $ 26.12          
Restricted Stock, Nonvested at End of Period, Number     184,375     158,908          
Restricted Stock, Nonvested at End of Period, Weighted Average Grant Date Fair Value     $ 39.57     $ 29.07          
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded             64,975 62,025 57,375    
Payout Percentage for Exceeding Performance Target                     114.00%
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures                   6,996  
Restricted Stock, Vested in Period, Total Fair Value       $ 2.6 $ 2.8            
Restricted Stock, Vested in Period, Tax Benefits       $ 0.9 $ 1.0            
Share-based Compensation, Initial Grant For Non Employee Director, Options   4,000                  
Share Based Compensation Arrangement By Share Based Payment Award, Automatic Annual Grant, Non-Employee Directors, Options   4,000                  
Performance Period     3 years                
Annual Awards of Deferred Stock Units to be Issued to each Non-Employee Director 500                    
Deferred Stock Units Issued 4,000                    
Fair Value per Deferred Stock Unit Issued $ 31.50