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Long-term Equity-based Compensation Plans Omnibus Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares Available for Grant under Omnibus Plan 8,228,184  
Equity-based Compensation Expense $ 2.6 $ 0.8
Unamortized Compensation Expense Related to Nonvested Awards $ 8.5  
Unamortized Compensation Expense Related to Nonvested Awards, Period for Recognition 1 year 7 months 6 days  
Performance Based Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded 552,450