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Long-Term Loans, Net Of Current Maturities (Summary Of Long-Term Loans, Net Of Current Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Long-term Debt, total $ 205,525 $ 400,270
Less: current maturities 31,781 98,015
Long-term debt noncurrent 173,745 302,255
U.S. Dollars [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Interest percentage Libor +1.25-2.5% [1]  
Long-term Debt, total 174,381 [1] 369,564 [1]
GBP [Member]
   
Debt Instrument [Line Items]    
Interest percentage spread 2.20%  
GBP [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Interest percentage Libor + 1.11-3.28%  
Long-term Debt, total 29,917 29,298
Other Currency [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Interest percentage Libor + 1.7-4%  
Long-term Debt, total $ 1,228 $ 1,408
Maximum [Member] | U.S. Dollars [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Years of maturity 3 years [2]  
Interest percentage spread 2.50% [1]  
Maximum [Member] | GBP [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Years of maturity 3 years  
Interest percentage spread 3.28%  
Maximum [Member] | Other Currency [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Years of maturity 3 years  
Interest percentage spread 4.00%  
Minimum [Member] | U.S. Dollars [Member]
   
Debt Instrument [Line Items]    
Interest percentage spread 1.25%  
Minimum [Member] | U.S. Dollars [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Years of maturity 2 years [2]  
Interest percentage spread 1.25% [1]  
Minimum [Member] | GBP [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Years of maturity 1 year  
Interest percentage spread 1.11%  
Minimum [Member] | Other Currency [Member] | Long-Term Bank Loans [Member]
   
Debt Instrument [Line Items]    
Years of maturity 1 year  
Interest percentage spread 1.70%  
[1] For covenants see Note 20(F).
[2] For Covenants see Note 20(F).