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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Liabilities: |  |  |
Interest rate derivatives | $ 4,400 |  | $ 30,863
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets: |  |  |
Common stocks | 446 | [1] |
Assets | 7,068 |  |
Liabilities: |  |  |
Deferred compensation plan liability | 6,622 | [2] |
Liabilities | 6,622 |  |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds |  |  |
Assets: |  |  |
Marketable securities in deferred compensation plan | 5,911 | [1] |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common stocks |  |  |
Assets: |  |  |
Marketable securities in deferred compensation plan | 470 | [1] |
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |  |
Assets: |  |  |
Marketable securities in deferred compensation plan | 241 | [1] |
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Warrants to purchase common shares in KEYW | 207 | [3] |
Assets | 207 |  |
Liabilities: |  |  |
Deferred compensation plan liability | 0 | [2] |
Interest rate derivatives | 4,400 |  |
Liabilities | 4,400 |  |
Fair value measurement on a recurring basis | Total Estimated Fair Value |  |  |
Assets: |  |  |
Common stocks | 446 | [1] |
Warrants to purchase common shares in KEYW | 207 | [3] |
Assets | 7,275 |  |
Liabilities: |  |  |
Deferred compensation plan liability | 6,622 | [2] |
Interest rate derivatives | 4,400 |  |
Liabilities | 11,022 |  |
Fair value measurement on a recurring basis | Total Estimated Fair Value | Mutual funds |  |  |
Assets: |  |  |
Marketable securities in deferred compensation plan | 5,911 | [1] |
Fair value measurement on a recurring basis | Total Estimated Fair Value | Common stocks |  |  |
Assets: |  |  |
Marketable securities in deferred compensation plan | 470 | [1] |
Fair value measurement on a recurring basis | Total Estimated Fair Value | Other |  |  |
Assets: |  |  |
Marketable securities in deferred compensation plan | $ 241 | [1] |
[1] | Included in the line entitled “restricted cash and marketable securities” on our consolidated balance sheet.
[2] | Included in the line entitled “other liabilities” on our consolidated balance sheet.
[3] | Included in the line entitled “prepaid expenses and other assets” on our consolidated balance sheet.

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- Definition Represents the aggregate of the investment in common stock of other entities reported on the balance sheet at the end of the period measured at fair value by the entity, excluding amounts held under deferred compensation arrangements. + References No definition available. + Details
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