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Equity - Treasury Stock Activity (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Equity, Class of Treasury Stock [Line Items]    
Value of shares withheld for taxes $ 3,865  
Treasury Stock
   
Equity, Class of Treasury Stock [Line Items]    
Number of shares withheld for taxes 637 5,107
Value of shares withheld for taxes $ 3,865 $ 27,196