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Equity - Treasury Stock Activity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items]      
Value of shares withheld for taxes $ 30,126 $ 11,312 $ 10,834
Treasury Stock
     
Equity, Class of Treasury Stock [Line Items]      
Number of shares withheld for taxes 5,679 1,547 1,176
Value of shares withheld for taxes $ 30,126 $ 11,312 $ 10,834