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Accounts Receivable
9 Months Ended
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Accounts Receivable
Accounts Receivable

Net accounts receivable consisted of the following as of September 30, 2017 and December 31, 2016 (in thousands):
 
 
September 30,
2017
 
December 31,
2016
Trade accounts receivable
$
285,310

 
$
260,976

Unbilled accounts receivable
117,888

 
113,765

Gross accounts receivable
403,198

 
374,741

Allowance for doubtful accounts
(2,055
)
 
(829
)
Reserve for cash-basis customers
(304
)
 
(5,316
)
Total accounts receivable reserves
(2,359
)
 
(6,145
)
Accounts receivable, net
$
400,839

 
$
368,596



The decrease to the reserve for cash-basis customers is primarily attributable to two customers that were removed from cash-basis revenue recognition due to a strong, consistent history of payment.