Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 133,583	$ 127,210
Accounts receivable and unbilled receivables, net of allowances of $3,204 and $3,227, respectively	188,918	218,362
Inventories	114,245	108,011
Prepaid expenses	13,297	14,478
Other current assets	15,122	15,177
Total current assets	465,165	483,238
Property and equipment, net	57,866	54,246
Long-term investment in sales-type leases, net	20,961	19,750
Operating lease right-of-use assets	52,537	56,130
Goodwill	335,034	336,539
Intangible assets, net	115,710	124,867
Long-term deferred tax assets	14,154	14,142
Prepaid commissions	44,822	48,862
Other long-term assets	116,197	103,036
Total assets	1,222,446	1,240,810
Current liabilities:
Accounts payable	34,587	46,380
Accrued compensation	41,057	44,155
Accrued Liabilities, Current	52,979	55,567
Deferred revenues, net	107,940	90,894
Total current liabilities	236,563	236,996
Long-term deferred revenues	6,101	7,083
Long-term deferred tax liabilities	29,561	39,090
Long-term operating lease liabilities	46,690	50,669
Other long-term liabilities	16,070	11,718
Long-term debt	0	50,000
Total liabilities	334,985	395,556
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued	0	0
Common stock, $0.001 par value, 100,000 shares authorized; 51,902 and 51,277 shares issued; 42,757 and 42,132 shares outstanding, respectively	52	51
Treasury stock at cost, 9,145 shares outstanding, respectively	(185,074)	(185,074)
Additional paid-in capital	820,632	780,931
Retained earnings	265,540	258,792
Accumulated other comprehensive loss	(13,689)	(9,446)
Total stockholders’ equity	887,461	845,254
Total liabilities and stockholders’ equity	$ 1,222,446	$ 1,240,810