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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share based compensation expense and related tax benefit        
Share-based compensation expense $ 7,517 $ 3,898 $ 12,820 $ 7,523
Tax (expense) benefit $ 2,501 $ 1,364 $ 4,261 $ 2,633