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Stock-Based Compensation (Summary Activity Of RSU Awards) (Details) (Restricted Stock Awards [Member], USD $)
9 Months Ended
Sep. 30, 2011
Restricted Stock Awards [Member]
 
Number of Shares, Nonvested at January 1, 2011787,798
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(388,151)
Weighted-Average Grant Date Fair Value, Vested$ 14.38
Number of Shares, Forfeited(59,396)
Weighted-Average Grant Date Fair Value, Forfeited$ 15.58
Number of Shares, Nonvested at September 30, 2011340,251[1]
Weighted-Average Grant Date Fair Value, Nonvested at September 30, 2011$ 15.59[1]
Number of shares, expected to vest322,998
[1]322,998 of these shares are expected to vest.