Accounts Receivable, Net (Tables)

6 Months Ended

Jun. 30, 2014

Receivables [Abstract]

Accounts Receivable, Net

Accounts receivable balances at June 30, 2014 and December 31, 2013 were as follows (in thousands):

	June 30, 2014			December 31, 2013
Trade accounts receivable	$	127,935		$	109,739
Unbilled revenue		61,422			43,546
Total accounts receivable		189,357			153,285
Allowance for doubtful accounts		(10,235	)		(10,178	)
Accounts receivable, net	$	179,122		$	143,107