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Equity-Based Compensation Plans Equity-Based Compensation Plans Assumption Used in Monte Carlo Model to Estimate Fair Value of Performance Shares Awards (Details) (Performance shares, USD $)
12 Months Ended
Dec. 31, 2013
Performance shares
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Closing price of stock on date of grant $ 47.30
Risk free rate 0.35%
Measurement period 3 years
Volatility 30.00%