Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation And Cash-Based Incentive Compensation (Schedule Of Compensation Expense Under Share-Based Payment Arrangements And Related Tax Benefit) (Details)

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Share-Based Compensation And Cash-Based Incentive Compensation (Schedule Of Compensation Expense Under Share-Based Payment Arrangements And Related Tax Benefit) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
30803 - Disclosure - Share-Based And Cash-Based Incentive Compensation [Line Items]    
Share-based compensation $ 2,659 $ 1,826
Tax benefit computed at the statutory rate 931 639
Restricted Stock [Member]
   
30803 - Disclosure - Share-Based And Cash-Based Incentive Compensation [Line Items]    
Share-based compensation 106 588
Restricted Stock Units (RSUs) [Member]
   
30803 - Disclosure - Share-Based And Cash-Based Incentive Compensation [Line Items]    
Share-based compensation $ 2,553 $ 1,238