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Series A Notes, Net Of Current Maturities (Narrative) (Details)
 1 Months Ended 12 Months Ended
May 31, 2012
USD ($)
May 31, 2012
ILS
Mar. 31, 2012
USD ($)
Mar. 31, 2012
ILS
Jun. 30, 2010
USD ($)
item
Jun. 30, 2010
ILS
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
ILS
May 31, 2012
4.84% First Amount [Member]
ILS
May 31, 2012
4.84% Second Amount [Member]
ILS
May 31, 2012
Average spread 2.02% [Member]
USD ($)
May 31, 2012
Average spread 2.285% [Member]
USD ($)
Dec. 31, 2012
LIBOR 0.45% [Member]
Derivative [Line Items]                              
Notes issued           1,100,000,000                  
Amount of Series A Note 24,407,000 92,000,000 217,420,000 807,000,000                      
Proceeds from issuance of Series A Notes 24,900,000 95,000,000 224,000,000 831,000,000 283,000,000   246,973,000   283,213,000            
Number of equal annual installments associated with note, in installments         10 10                  
Description of maturity period         payable in 10 equal annual installments on June 30 of each of the years 2011 through 2020. payable in 10 equal annual installments on June 30 of each of the years 2011 through 2020.                  
Fixed interest rate of Series A Notes         4.84% 4.84% 4.84%   4.84%            
Maturity date of first interest payment         Dec. 30, 2010 Dec. 30, 2010                  
Interest expense on Series A Notes             10,787,000 5,753,000 4,395,000            
Cross currency interest rate swap transaction term, in years             10 years                
Cross currency interest rate swap, amount             287,000,000     1,100,000,000 807,000,000 92,000,000 217,300,000 24,100,000  
Average spread on LIBOR             1.65%   1.84%       2.02% 2.285% 1.84%
Effective interest rate             0.45%                
Fixed interest rate                     4.84%        
LIBOR measurement term, in months             6 months                
Series A Notes issuance costs 94,000   2,010,000   2,530,000   2,035,000   2,530,000            
Series A Notes issuance costs, discount     1,795,000   2,164,000                    
Premium amount 260,000   3,675,000                        
Amortization of deferred issuance costs     215,000   366,000   153,000 422,000 258,000            
Amortization of Series A Notes discount (premium) and related issuance costs, net             $ 153,000 $ 422,000 $ (258,000)            
Variable rate basis of fair value hedge transactions             Under the cross currency interest rate swaps, the Company will receive fixed NIS at a rate of 4.84% on NIS 1.1 billion and pay floating six-month USD LIBOR + an average spread of 1.65% on $287,000, which reflects the U.S. dollar value of the Series A Notes on the specific dates the transactions were consumed.