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Significant Accounting Policies (Narrative) (Details) Share data in Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2010 ILS | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2011 UAV Tactical Systems Ltd [Member] | Dec. 31, 2010 Interest Rate Swap [Member] USD ($) | Dec. 31, 2011 Series A [Member] USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reduction of allocation to non-controlling interest |  | $ 0 |  |  |  |  |
Reclassification of non-credit related amount |  | 7,086 |  |  |  |  |
Reclassification of non-credit related amount, net of tax |  | 1,772 |  |  |  |  |
Percentage of minority voting rights |  | 20.00% |  |  |  |  |
Percentage of equity voting rights |  | 50.00% |  |  |  |  |
Voting rights |  |  |  |  | 51.00% |  |
Severance expenses |  | 50,018 | 50,228 | 42,999 |  |  |
Percentage of revenue from service |  | 10.00% | 10.00% | 10.00% |  |  |
Notes issued | 1,100,000,000 |  |  |  |  |  |
Notional principal |  |  |  |  |  | 1,100,000,000 |
Received interest payments semi-annually in NIS |  |  | 4.84% |  |  |  |
Term, interest rate swap transaction |  |  | 10 |  |  |  |
Derivative, Basis Spread on Variable Rate |  |  | 1.65% |  |  |  |
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 entered. | The purpose of these transactions was to convert the NIS fixed rate Series A Notes into USD LIBOR (6 months) floating rate obligations. As a result of these agreements, the Company is currently paying an effective interest rate of six-month LIBOR (0.45% at December 31, 2011) plus an average of 1.65% on the principal amount, as compared to the original 4.84% fixed rate. |  |  |  |
Senior notes fair value |  |  |  |  |  |  | $ 264,931,000
Outstanding anti-dilutive stock options excluded from the calculations of diluted net earnings per share |  | 76,815 | 23,041 | 22,599 |  |  |

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