Accounts Receivable (Table)

12 Months Ended

Dec. 31, 2012

Accounts Receivable

Schedule of components of accounts receivables

December 31,	2012			2011
(in thousands)
Trade receivables:
Billed	$	310,997		$	367,718
Unbilled		82,649			99,913
Other receivables		2,994			1,734
Total		396,640			469,365
Less: allowance for doubtful accounts		(9,110	)		(8,093	)
Accounts receivable, net	$	387,530		$	461,272

Schedule of changes in allowance for doubtful accounts

Years Ended December 31,	2012			2011
(in thousands)
Beginning balance	$	8,093		$	8,695
Bad debt expense		1,784			2,868
Accounts written-off		(1,132	)		(3,820	)
Recoveries		365			350
Ending balance	$	9,110		$	8,093