| CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010 | 
|---|---|---|
| CONSOLIDATED BALANCE SHEETS [Abstract] | ||
| Accounts receivable, less allowance | $ 10,839 | $ 10,898 | 
| X | ||||||||||
| 
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Details 
 |