| 
           Interest and Other, Net (Tables) 
         | 
        12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 
           Dec. 31, 2011 
         | 
      ||||||||||||||||||||||||||||||||||||||||||||||
| Interest and Other, Net (Tables) [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Interest And Other, Net [Table Text Block] | 
 The components of interest and other, net were as follows: 
  | 
      |||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Interest and other, net [Table Text Block] No definition available. 
  |