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Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Schedule of Accounts Receivable
Net accounts receivable consisted of the following (in thousands):
 
 
June 30,
2013
 
December 31,
2012
Trade accounts receivable
$
163,220

 
$
143,533

Unbilled accounts
78,698

 
79,051

Gross accounts receivable
241,918

 
222,584

Allowance for doubtful accounts
(1,137
)
 
(1,154
)
Reserve for cash-basis customers
(3,495
)
 
(2,653
)
Total accounts receivable reserves
(4,632
)
 
(3,807
)
Accounts receivable, net
$
237,286

 
$
218,777