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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. |  |  |  |  |  |  |  |

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