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Taxes On Income (Narrative) (Details)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Y
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
Israeli Tax Authority [Member]
ILS
Dec. 31, 2011
Israeli Taxation [Member]
Dec. 31, 2010
Israeli Taxation [Member]
Dec. 31, 2011
Encouragement Of Industry (Taxes) 1996 [Member]
Y
Dec. 31, 2011
U.S. Federal [Member]
USD ($)
Y
Dec. 31, 2011
U.S. State [Member]
USD ($)
Dec. 31, 2011
Research And Development Tax Credits [Member]
USD ($)
Dec. 31, 2011
2011-2012 [Member]
Development Zone A [Member]
Dec. 31, 2011
2011-2012 [Member]
Elsewhere In Israel [Member]
Dec. 31, 2011
2013-2014 [Member]
Development Zone A [Member]
Dec. 31, 2011
2013-2014 [Member]
Elsewhere In Israel [Member]
Dec. 31, 2011
2014 and Thereafter [Member]
Development Zone A [Member]
Dec. 31, 2011
2014 and Thereafter [Member]
Elsewhere In Israel [Member]
Dec. 31, 2011
Approved Enterprise [Member]
USD ($)
Dec. 31, 2011
Privileged Enterprise [Member]
USD ($)
Dec. 31, 2011
Minimum [Member]
Y
Dec. 31, 2011
Minimum [Member]
U.S. State [Member]
Dec. 31, 2011
Minimum [Member]
Research And Development Tax Credits [Member]
Dec. 31, 2011
Maximum [Member]
Y
Dec. 31, 2011
Maximum [Member]
U.S. State [Member]
Dec. 31, 2011
Maximum [Member]
Research And Development Tax Credits [Member]
Operating Loss Carryforwards [Line Items]                                                
Uncertain tax positions interest expense $ 13,587,000 $ 10,695,000 $ 8,239,000                                          
Uncertain tax positions income tax accrual 48,025,000 34,438,000                                            
Taxes payable       197,000,000                                        
Effective income tax rate         24.00% 25.00%                                    
Future effective income tax rate 25.00%                                              
Effective real capital gains tax rate 25.00%                                              
Enacted effective income tax rate (6.00%) (8.00%) (13.00%)               10.00% 15.00% 7.00% 12.50% 6.00% 12.00%     10.00%          
Dividend income tax rate 15.00%                                              
Number of investment program granting status                                 6              
Number of investment programs ended                                 4              
Amendment of plans for gaining privileged rights                                   seventh eighth and ninth plans            
Privileges expiration year                                   2019            
Income tax exemption period (in years) 2                                              
Tax period based on foreign investments (in years)                                     5     8    
Common shares repurchased, shares 5,590,000 5,650,000 7,810,000                             84,831,728            
Common shares repurchased, value 300,000,000 200,000,000 202,285,000                             2,068,576,000            
Retained earnings exempt from tax 3,973,045,000 3,429,079,000                             713,007,000 1,024,198,000            
Income tax liability incurred                                 163,617,000 163,655,000            
Fixed assets amortization period (in years)             8                                  
Minimum percentage of income in tax year from industrial production to be considered an "Industrial Company" in Israel 90.00%                                              
Undistributed earnings 93,443,000                                              
U.S. federal loss carryforward               654,000,000 665,000,000 10,000,000                            
Operating loss carryforwards offset period (in years)               20                                
Operating loss carryforward expiration years               2024                       2012 2019   2024 2028
Compensation expense recognized transferred to additional paid-in capital               $ 0