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ACCOUNTS RECEIVABLE RESERVES (Tables)
 12 Months Ended
Dec. 31, 2011
Accounts Receivable Reserves Disclosure [Abstract]  
Changes in accounts receivable reserves
Changes in accounts receivable reserves consisted of the following (in thousands):
 
 
For the Year Ended December 31,
 
2011
 
2010
 
2009
Balance, beginning of year
$
6,353

 
$
5,023

 
$
8,429

Provision charged to expense
9,331

 
7,102

 
3,227

Charge-offs and adjustments
(9,449
)
 
(5,554
)
 
(6,873
)
Currency translation adjustments
(132
)
 
(218
)
 
240

Balance, end of year
$
6,103

 
$
6,353

 
$
5,023