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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Notes)
 12 Months Ended
Dec. 31, 2013
Valuation Allowances And Reserves [Abstract]  
ALLOWANCE FOR DOUBTFUL ACCOUNTS
ALLOWANCE FOR DOUBTFUL ACCOUNTS
The table below presents a rollforward of our allowance for doubtful accounts for the years ended December 31, 2013, 2012 and 2011:
 
 
 
Additions
 
 
 
Balance at
Beginning
of Period
 
Charged to
Expense
 
Charged to
Other
Accounts
 
Deductions
 
Balance at
End of
Period
 
(in thousands)
As of December 31, 2013
$
2,860

 
$
634

 
$
—

 
$
(2,728
)
 
$
766

As of December 31, 2012
8,013

 
1,299

 
6

 
(6,458
)
 
2,860

As of December 31, 2011
7,717

 
2,559

 
519

 
(2,782
)
 
8,013