| 
           Income Taxes (Details 3) (USD $) 
        In Thousands, unless otherwise specified  | 
        12 Months Ended | |
|---|---|---|
| 
           Dec. 31, 2011 
         | 
        
           Dec. 31, 2010 
         | 
      |
| Changes in our uncertain income tax positions | ||
| Balance, beginning of year | $ 942 | $ 0 | 
| Additions for tax positions from prior years | 490 | 942 | 
| Interest | 92 | |
| Balance, end of year | $ 1,524 | $ 942 | 
| X | ||||||||||
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- Definition 
          Unrecognized tax benefits increase resulting from interest. No definition available. 
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| X | ||||||||||
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- Details 
          
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| X | ||||||||||
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- Definition 
          The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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