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Accounts Receivable
12 Months Ended
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Accounts Receivable
Accounts Receivable:
Net accounts receivable consisted of the following (in thousands):
 
 
December 31,
2011
 
2010
Trade accounts receivable
$
142,166

 
$
116,212

Unbilled accounts
73,325

 
64,386

Gross accounts receivable
215,491

 
180,598

Allowance for doubtful accounts
(1,627
)
 
(1,329
)
Reserve for cash-basis customers
(2,928
)
 
(3,903
)
Total accounts receivable reserves
(4,555
)
 
(5,232
)
Accounts receivable, net
$
210,936

 
$
175,366