Quarterly report pursuant to Section 13 or 15(d)

Share Based Compensation (Expense) (Details 1)

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Share Based Compensation (Expense) (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share based compensation expense and related tax benefit    
Share-based compensation expense $ 5,303 $ 3,625
Tax (expense) benefit $ 1,759 $ 1,269