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Accounts Receivable (Notes)
 12 Months Ended
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Accounts Receivable
Accounts Receivable

Net accounts receivable consisted of the following as of December 31, 2013 and 2012 (in thousands):
 
 
December 31, 2013
 
December 31, 2012
Trade accounts receivable
$
175,391

 
$
143,533

Unbilled accounts
100,300

 
79,051

Gross accounts receivable
275,691

 
222,584

Allowance for doubtful accounts
(708
)
 
(1,154
)
Reserve for cash-basis customers
(2,995
)
 
(2,653
)
Total accounts receivable reserves
(3,703
)
 
(3,807
)
Accounts receivable, net
$
271,988

 
$
218,777



A summary of activity in the accounts receivable reserves for the years ended December 31, 2013, 2012 and 2011, is as follows (in thousands):

 
2013
 
2012
 
2011
Beginning balance
$
3,807

 
$
4,555

 
$
5,232

Charges to income from operations
17,900

 
15,599

 
16,165

Write-offs
(486
)
 
(47
)
 
(420
)
Collections from cash basis customers
(17,518
)
 
(16,300
)
 
(16,422
)
Ending balance
$
3,703

 
$
3,807

 
$
4,555



Charges to income from operations represent charges to bad debt expense for increases in the allowance for doubtful accounts and reductions to revenue for increases in reserves for cash basis customers.