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Stockholders' Equity (Schedule Of Restricted Stock Activity) (Details) (Restricted Stock [Member], USD $)
3 Months Ended
Mar. 31, 2012
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Number of shares 380,944
Grants, Number of shares 72,013
Vested shares, Number of shares (15,806)
Forfeitures, Number of shares (529)
Ending Balance, Number of shares 436,622
Beginning Balance, Weighted-average grant price $ 194.26
Grants, Weighted-average grant price $ 115.55
Vested shares, Weighted-average grant price $ 217.77
Forfeitures, Weighted-average grant price $ 132.23
Ending Balance, Weighted-average grant price $ 180.45