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Significant Accounting Policies (Narrative) (Details) | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  |  |  |  | 2 Months Ended | 12 Months Ended |
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 ILS | Dec. 31, 2012 ILS | May 31, 2012 USD ($) | May 31, 2012 ILS | Mar. 31, 2012 USD ($) | Mar. 31, 2012 ILS | Jun. 30, 2010 ILS | Dec. 31, 2013 UAV Tactical Systems Ltd | Dec. 31, 2013 Advance Flight Training Limited Partnership | Dec. 31, 2013 Series A USD ($) | Dec. 31, 2012 Series A ILS | Jun. 30, 2012 Series A ILS | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum | May 31, 2012 Cross Currency Interest Rate Swaps London Interbank Offered Rate (LIBOR) | Dec. 31, 2013 Cross Currency Interest Rate Swaps London Interbank Offered Rate (LIBOR) | Dec. 31, 2013 Cross Currency Interest Rate Swaps London Interbank Offered Rate (LIBOR) Senior Notes | Dec. 31, 2012 Cross Currency Interest Rate Swaps London Interbank Offered Rate (LIBOR) Senior Notes
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Components of accumulated other comprehensive income loss, tax | $ 12,604,000 | $ 23,744,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, tax benefit | 24,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefit Plans, tax benefit | 12,580,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity voting rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 50.00% |  |  |  |
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% | 100.00% |  |  |  |  |  |  |  |  |
Contractual rights percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Minimum term of maturity where deposits are considered long-term, in years | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance expenses | 54,544,000 | 58,326,000 | 50,018,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue sold, change in estimate | (5,300,000) | (36,000,000) | (26,800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of cost of revenue sold | 0.25% | 1.74% | 1.28% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross profit | 0.64% | 4.41% | 3.66% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue sold, increase (decrease) to net income | 4,600,000 | 32,500,000 | 23,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue sold, increase (cecrease) in earnings per share, diluted | $ 0.11 | $ 0.77 | $ 0.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from service | 10.00% | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance amount of Series A Note | 423,509,000 | 450,040,000 |  |  |  | 24,407,000 | 92,000,000 | 217,420,000 | 807,000,000 | 1,100,000,000 |  |  |  |  | 900,000,000 |  |  |  |  |  |
Cross currency interest rate swap, amount | 287,000,000 |  |  | 1,100,000,000 | 1,100,000,000 |  |  |  |  |  |  |  |  | 900,000,000 |  |  |  |  |  |  |
Received interest payments semi-annually in NIS | 4.84% | 4.84% |  |  |  | 4.84% | 4.84% |  |  | 4.84% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | LIBOR | LIBOR |
Derivative, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.65% |  | 1.84%
Senior notes fair value |  |  |  |  |  |  |  |  |  |  |  |  | 457,136,000 |  |  |  |  |  |  |  |
Rights sold to receive payments from the Israeli Ministry of Defense | $ 161,693,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding anti-dilutive stock options excluded from the calculations of diluted net earnings per share | 45,031 | 125,709 | 76,815 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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