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Prepaid Expenses and Other Assets (Details 3) (KEYW Holding Corporation, USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
KEYW Holding Corporation |  |  |
Investment in The KEYW Holding Corporation ("KEYW") |  |  |
Number of shares owned in equity method investee (in shares) |  | 3,100,000 |
Ownership percentage in equity method investee |  | 12.00% |
Number of investee shares owned accounted for as trading securities (in shares) | 1,900,000 |  |
Ownership percentage in investee accounted for as trading securities (as a percent) | 7.00% |  |
Carrying value of equity method investment |  | $ 22,300,000 |
Fair value of trading securities | 13,800,000 |  |
Number of shares under sales plan (in shares) | 1,600,000 |  |
Number of shares sold (in shares) | 500,000 |  |
Gain on sale of equity method investment | 2,100,000 |  |
Warrants |  |  |
Number of warrants owned (in shares) | 50,000 |  |
Exercise price of warrants (in dollars per share) |  | $ 9.25 |
Estimated fair value of warrants | 125,000 | 466,000 |
Estimated fair value of warrants per warrant (in dollars per warrant) | $ 2.51 | $ 9.32 |
Amount at which warrants were acquired | 210,000 | 210,000 |
Lease revenue | $ 780,000 | $ 668,000 | $ 315,000

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