Contract Balances (Tables)

6 Months Ended

Jun. 30, 2018

Contract With Customer Asset And Liability [Abstract]

Schedule of Accounts Receivable

Accounts receivable (in thousands) consisted of the following, as of:

	June 30,			December 31,
	2018			2017
				(as adjusted)
Billed and billable	$	129,034		$	169,554
Less: allowance for doubtful accounts		(3,919	)		(4,190	)
Accounts receivable, net	$	125,115		$	165,364

Deferred Revenue and Advance Payments

Deferred revenue and advance payments (in thousands) from customers consisted of the following, as of:

	June 30,		December 31,
	2018		2017
			(as adjusted)
Current:
Deferred product licenses revenue	$	1,819	$	3,760
Deferred subscription services revenue		13,847		17,324
Deferred product support revenue		151,909		168,185
Deferred other services revenue		7,783		9,465
Total current deferred revenue and advance payments	$	175,358	$	198,734
Non-current:
Deferred product licenses revenue	$	794	$	820
Deferred subscription services revenue		9		126
Deferred product support revenue		3,950		4,826
Deferred other services revenue		1,063		628
Total non-current deferred revenue and advance payments	$	5,816	$	6,400