Accounts Receivable, Net (Tables)

3 Months Ended

Mar. 31, 2014

Receivables [Abstract]

Accounts Receivable, Net

Accounts receivable balances at March 31, 2014 and December 31, 2013 were as follows (in thousands):

	March 31, 2014			December 31, 2013
Trade accounts receivable	$	118,151		$	109,739
Unbilled revenue		77,505			43,546
Total accounts receivable		195,656			153,285
Allowance for doubtful accounts		(11,204	)		(10,178	)
Accounts receivable, net	$	184,452		$	143,107