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Condensed Consolidated Statements of Equity (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Repurchase of common shares4,585,593 
Tax payments related to shares withheld for vested stock and RSUs$ 9,509$ 11,881
Shares issued on compensation plans2,067,0883,171,652
Common Stock
  
Repurchase of common shares4,585,593 
Tax payments related to shares withheld for vested stock and RSUs9,50811,881
Shares issued on compensation plans2,067,0883,171,652
Additional Paid-in Capital
  
Repurchase of common shares4,585,593 
Tax payments related to shares withheld for vested stock and RSUs9,50811,881
Shares issued on compensation plans2,067,0883,171,652
Retained Earnings (Accumulated Deficit)
  
Tax payments related to shares withheld for vested stock and RSUs$ 9,508$ 11,881
Shares issued on compensation plans2,067,0883,171,652