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Share-Based Compensation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Summary of the activity related to stock options granted under the Company's Incentive Plan 
Total Shares outstanding, beginning balance4,026
Total Shares, granted1,250
Total Shares, exercised(123)
Total Shares, forfeited, canceled or expired(144)
Total Shares outstanding, ending balance5,009
Total Shares, exercisable1,587
Total Shares, available for issuance2,063
Weighted Average Exercise Price per Share Outstanding, beginning balance$ 14.24
Weighted Average Exercise Price per Share, granted$ 15.34
Weighted Average Exercise Price per Share, exercised$ 12.00
Weighted Average Exercise Price per Share, forfeited, canceled or expired$ 17.16
Weighted Average Exercise Price per Share Outstanding, ending balance$ 14.48
Weighted Average Exercise Price per Share, exercisable$ 13.15
Weighted Average Remaining Contractual Term (Years), Outstanding7.92
Weighted Average Remaining Contractual Term (Years), Exercisable7.30
Aggregate Intrinsic Value, Outstanding$ 8,365[1]
Aggregate Intrinsic Value, Exercisable$ 4,762[1]
[1]Aggregate intrinsic value represents the value of our closing stock price on Sept 30, 2011 ($16.15) in excess of the exercise price multiplied by the number of options outstanding or exercisable.