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Share-Based Compensation (Schedule Of Share-Based Compensation Information) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Share-Based Compensation [Abstract]        
Expense relating to share grants (including the equity and liability awards) $ 1,149,000 $ 978,000 $ 2,885,000 $ 4,789,000
Adjustments to reflect changes in market price of Company's common stock   (39,000) 10,000 (707,000)
Total charged to operations 1,149,000 [1] 939,000 [1] 2,895,000 [1] 4,082,000 [1]
Accelerated vestings included in management transition charges $ 362,000 $ 0 $ 362,000 $ 1,980,000
[1] The amounts charged to operations include $362,000, $0, $362,000, and $1,980,000, respectively, applicable to accelerated vestings included in management transition charges and employee termination costs.