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Significant Accounting Policies (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2010 ILS | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 ILS | May 31, 2012 USD ($) | May 31, 2012 ILS | Mar. 31, 2012 USD ($) | Mar. 31, 2012 ILS | Dec. 31, 2012 UAV Tactical Systems Ltd [Member] | Dec. 31, 2012 Series A [Member] USD ($) | Dec. 31, 2010 Series A [Member] USD ($) | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Minimum [Member]
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income loss, tax |  | $ 23,845,000 | $ 25,419,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of equity voting rights |  | 51.00% |  |  |  |  |  |  |  |  |  |  | 50.00% | 20.00%
Amount in which the company discontinues applying the equity method for investments |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Reduction of allocation to non-controlling interest |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Voting rights |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |
Minimum term of maturity where deposits are considered long-term, in years |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Severance expenses |  | 58,326 | 50,018 | 50,228 |  |  |  |  |  |  |  |  |  |
Percentage of revenue from service |  | 10.00% | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |
Notes issued | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance amount of Series A Note |  |  |  |  |  | 24,407,000 | 92,000,000 | 217,420,000 | 807,000,000 |  | 900,000,000 | 1,100,000,000 |  |
Received interest payments semi-annually in NIS | 4.84% | 4.84% |  | 4.84% |  |  |  |  |  |  |  |  |  |
Cross currency interest rate swap, amount |  | 287,000,000 |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |
Derivative, Basis Spread on Variable Rate |  | 1.65% |  | 1.84% |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |  |  |  |
Senior notes fair value |  |  |  |  |  |  |  |  |  |  | $ 477,943,000 |  |  |
Outstanding anti-dilutive stock options excluded from the calculations of diluted net earnings per share |  | 125,709 | 76,815 | 23,041 |  |  |  |  |  |  |  |  |  |

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