| 
           Fair Value Measurements (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Mar. 31, 2012 
         | 
        
           Dec. 31, 2011 
         | 
      
|---|---|---|
| Liabilities: | ||
| Interest rate derivatives | $ 2,673 | $ 30,863 | 
| 
           Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) 
         | 
        ||
| Assets: | ||
| Common stocks | 454 | |
| Assets | 7,227 | |
| Liabilities: | ||
| Deferred compensation plan liability | 6,773 | |
| Liabilities | 6,773 | |
| 
           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 | 6,121 | |
| 
           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 | 414 | |
| 
           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 | 238 | |
| 
           Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2) 
         | 
        ||
| Assets: | ||
| Warrants to purchase common shares in KEYW | 133 | |
| Assets | 133 | |
| Liabilities: | ||
| Interest rate derivatives | 2,673 | |
| Liabilities | 2,673 | |
| 
           Fair value measurement on a recurring basis | Total Estimated Fair Value 
         | 
        ||
| Assets: | ||
| Common stocks | 454 | |
| Warrants to purchase common shares in KEYW | 133 | |
| Assets | 7,360 | |
| Liabilities: | ||
| Deferred compensation plan liability | 6,773 | |
| Interest rate derivatives | 2,673 | |
| Liabilities | 9,446 | |
| 
           Fair value measurement on a recurring basis | Total Estimated Fair Value | Mutual funds 
         | 
        ||
| Assets: | ||
| Marketable securities in deferred compensation plan | 6,121 | |
| 
           Fair value measurement on a recurring basis | Total Estimated Fair Value | Common stocks 
         | 
        ||
| Assets: | ||
| Marketable securities in deferred compensation plan | 414 | |
| 
           Fair value measurement on a recurring basis | Total Estimated Fair Value | Other 
         | 
        ||
| Assets: | ||
| Marketable securities in deferred compensation plan | $ 238 |