Accounts Receivable (Table)

12 Months Ended

Dec. 31, 2014

Accounts Receivable

Schedule of components of accounts receivables

December 31,	2014			2013
(in thousands)
Trade receivables:
Billed	$	521,693		$	368,583
Unbilled		125,363			80,806
Other receivables		3,025			1,240
Total		650,081			450,629
Less: allowance for doubtful accounts		(15,351	)		(13,497	)
Accounts receivable, net	$	634,730		$	437,132

Schedule of changes in allowance for doubtful accounts

Years Ended December 31,	2014			2013
(in thousands)
Beginning balance	$	13,497		$	9,110
Bad debt expense		2,280			8,815
Accounts written-off		(1,225	)		(5,421	)
Recoveries		799			993
Ending balance	$	15,351		$	13,497