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Stock Incentive and Employee Stock Purchase Plans (Details 3) (Restricted Stock [Member])
12 Months Ended
Dec. 31, 2012
Restricted Stock [Member]
 
Summary of restricted stock unit activity  
Non-vested at December 31, 2011 1,289,000
Granted 1,016,000
Vested (461,000)
Forfeited (182,000)
Non-vested at December 31, 2012 1,662,000