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ACCOUNTS RECEIVABLE
 3 Months Ended
Mar. 31, 2012
Receivables [Abstract]  
ACCOUNTS RECEIVABLE
ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following (amounts in thousands):
 
March 31,
2012
 
December 31,
2011
Accounts receivable
$
250,740

 
$
193,731

Allowance for doubtful accounts
(4,792
)
 
(4,204
)
Accounts receivable, net
$
245,948

 
$
189,527


 
Accounts receivable are reduced by an allowance for doubtful accounts which is based on historical losses.