Annual report pursuant to Section 13 and 15(d)

Share Based Compensation (Expense) (Details 1)

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Share Based Compensation (Expense) (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share based compensation expense and related tax benefit      
Share-based compensation expense $ 27,873 $ 19,666 $ 15,453
Tax (expense) benefit $ 9,298 $ 6,708 $ 5,408