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Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2011
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,

2011
 
December 31,

2010
Trade accounts receivable
$
124,235


 
$
116,212


Unbilled accounts
58,939


 
64,386


Gross accounts receivable
183,174


 
180,598


Allowance for doubtful accounts
(1,382
)
 
(1,329
)
Reserve for cash-basis customers
(3,532
)
 
(3,903
)
Total accounts receivable reserves
(4,914
)
 
(5,232
)
Accounts receivable, net
$
178,260


 
$
175,366