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Stock-Based Compensation (Details 4) (Restricted stock units [Member], USD $)
6 Months Ended
Jun. 30, 2012
Restricted stock units [Member]
 
Summary of restricted stock unit activity  
Restricted stock units outstanding, beginning balance 337,676
Granted 254,030
Vested (20,896)
Forfeited (27,300)
Restricted stock units outstanding, ending balance 543,510
Restricted stock units outstanding, weighted average price, beginning balance $ 17.77
Granted $ 16.65
Vested $ 28.72
Forfeited $ 17.03
Restricted stock units outstanding, weighted average price, ending balance $ 16.86