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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 46 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2012
PBRSUs
Mar. 31, 2012
PBRSUs
Minimum
Mar. 31, 2012
PBRSUs
Maximum
Mar. 31, 2012
RSUs
Mar. 02, 2012
RSUs
Feb. 02, 2012
RSUs
Mar. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Mar. 31, 2012
RSAs
Stock-Based Compensation                        
Matching contribution by entity (as a percent)               25.00% 25.00%      
Percentage of units vesting         0.00% 150.00%            
Increase in Additional Paid-In Capital due to conversion of the 2011 annual bonuses into RSUs             $ 0.6          
Vesting period (in years)             3 years          
Number of Shares                        
Unvested at the beginning of the period (in shares)             78,544         48,924
Granted (in shares)       45,553     188,844          
Forfeited (in shares)                       (221)
Vested (in shares)             (20,683)          
Unvested at the end of the period (in shares)       45,553     246,705         48,703
Weighted Average Grant-Date Fair Value                        
Unvested shares at the beginning of the period (in dollars per share)             $ 56.55         $ 40.20
Granted (in dollars per share)       $ 30.33     $ 26.43          
Forfeited (in dollars per share)                       $ 48.87
Vested (in dollars per share)             $ 29.06          
Unvested shares at the end of the period (in dollars per share)       $ 30.33     $ 35.80         $ 40.16
Number of Shares                        
Outstanding at beginning of year (in shares)                   52,819 52,819  
Outstanding at end of year (in shares)                   52,819 52,819  
Options exercisable at year-end (in shares)                   17,606    
Weighted Average Exercise Price                        
Outstanding at beginning of year (in dollars per share)                   $ 48.87 $ 48.87  
Outstanding at end of year (in dollars per share)                   $ 48.87 $ 48.87  
Options exercisable at year-end (in dollars per share)                   $ 48.87    
Total annual compensation cost recognized $ 0.8 $ 2.9 $ 34.4