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Stock-Based Compensation (Details 4) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock [Member]
     
Summary of restricted stock awards outstanding under the 2005 Plan, Number of Shares      
Beginning Balance 1,355 1,604 1,415
Granted 995 1,000 933
Vested (611) (823) (679)
Cancelled and forfeited (420) (426) (65)
Ending Balance 1,319 1,355 1,604
Summary of restricted stock awards outstanding under the 2005 Plan, Weighted Average Grant Date Fair Value      
Beginning Balance $ 3.21 $ 7.23 $ 6.28
Granted $ 2.64 $ 8.86 $ 8.27
Vested $ 6.42 $ 7.40 $ 6.50
Cancelled and forfeited $ 8.73 $ 7.81 $ 9.25
Ending Balance $ 4.60 $ 3.21 $ 7.23