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Share Options And Awards (Share Options Outstanding And Exercisable) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share Option Outstanding, Number 4,085,702
Share Option Outstanding, Weighted Average Remaining Contractual Life (years) 4 years 11 months
Share Option Outstanding, Weighted Average Exercise Price $ 28.98
Share Option Outstanding, Aggregate Intrinsic Value $ 0
Share Option Exercisable, Number 3,061,607
Share Option Exercisable, Weighted Average Exercise Price $ 31.42
Share Option Exercisable, Weighted Average Remaining Contractual Life (years) 4 years 2 months
Share Option Exercisable, Aggregate Intrinsic Value $ 0
$11.85 - $17.78 [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower $ 11.85
Range of Exercise Prices, Upper $ 17.78
Share Option Outstanding, Number 809,936
Share Option Outstanding, Weighted Average Remaining Contractual Life (years) 6 years 2 months
Share Option Outstanding, Weighted Average Exercise Price $ 11.85
Share Option Exercisable, Number 528,039
Share Option Exercisable, Weighted Average Exercise Price $ 11.85
Share Option Exercisable, Weighted Average Remaining Contractual Life (years) 6 years 2 months
$17.79 - $26.69 [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower $ 17.79
Range of Exercise Prices, Upper $ 26.69
Share Option Outstanding, Number 921,177
Share Option Outstanding, Weighted Average Remaining Contractual Life (years) 7 years 10 months
Share Option Outstanding, Weighted Average Exercise Price $ 23.76
Share Option Exercisable, Number 307,792
Share Option Exercisable, Weighted Average Exercise Price $ 23.40
Share Option Exercisable, Weighted Average Remaining Contractual Life (years) 7 years 8 months
$26.70 - $40.05 [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower $ 26.70
Range of Exercise Prices, Upper $ 40.05
Share Option Outstanding, Number 1,883,893
Share Option Outstanding, Weighted Average Remaining Contractual Life (years) 3 years 2 months
Share Option Outstanding, Weighted Average Exercise Price $ 34.27
Share Option Exercisable, Number 1,755,080
Share Option Exercisable, Weighted Average Exercise Price $ 34.42
Share Option Exercisable, Weighted Average Remaining Contractual Life (years) 3 years 1 month
$40.06 - $49.62 [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower $ 40.06
Range of Exercise Prices, Upper $ 49.62
Share Option Outstanding, Number 470,696
Share Option Outstanding, Weighted Average Remaining Contractual Life (years) 3 years 11 months
Share Option Outstanding, Weighted Average Exercise Price $ 47.46
Share Option Exercisable, Number 470,696
Share Option Exercisable, Weighted Average Exercise Price $ 47.46
Share Option Exercisable, Weighted Average Remaining Contractual Life (years) 3 years 11 months