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Stock-Based Compensation (Summary Activity Of RSU Awards) (Details) (Restricted Stock Awards [Member], USD $)
6 Months Ended
Jun. 30, 2011
Restricted Stock Awards [Member]
 
Number of Shares, Nonvested at January 1, 2011 787,798
Weighted-Average Grant Date Fair Value, Nonvested at January 1, 2011 $ 14.99
Number of Shares, Granted  
Weighted-Average Grant Date Fair Value, Granted  
Number of Shares, Vested (293,418)
Weighted-Average Grant Date Fair Value, Vested $ 14.26
Number of Shares, Forfeited (34,513)
Weighted-Average Grant Date Fair Value, Forfeited $ 15.47
Number of Shares, Nonvested at June 30, 2011 459,867 [1]
Weighted-Average Grant Date Fair Value, Nonvested at June 30, 2011 $ 15.43 [1]
Number of shares, expected to vest 435,998
[1] Of which, 435,998 shares are expected to vest.