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Revenues and Receivables (Tables)
 12 Months Ended
Dec. 31, 2011
Revenues and Receivables [Abstract]  
Components Of Contract Receivables
The components of contract receivables are as follows (in thousands):

 
December 31,
 
2011
 
2010
Billed receivables
$
422,954

 
$
411,018

Unbilled receivables:
 
 
 
Amounts billable
101,997

 
103,752

Revenues recorded in excess of funding
19,982

 
16,508

Retainage
5,264

 
6,433

Allowance for doubtful accounts
(9,729
)
 
(8,946
)
Total receivables, net
$
540,468

 
$
528,765