Accounts Receivable (Table)

12 Months Ended

Dec. 31, 2013

Accounts Receivable

Schedule of components of accounts receivables

December 31,	2013			2012
(in thousands)
Trade receivables:
Billed	$	368,583		$	310,997
Unbilled		80,806			82,649
Other receivables		1,240			2,994
Total		450,629			396,640
Less: allowance for doubtful accounts		(13,497	)		(9,110	)
Accounts receivable, net	$	437,132		$	387,530

Schedule of changes in allowance for doubtful accounts

Years Ended December 31,	2013			2012
(in thousands)
Beginning balance	$	9,110		$	8,093
Bad debt expense		8,815			1,784
Accounts written-off		(5,421	)		(1,132	)
Recoveries		993			365
Ending balance	$	13,497		$	9,110