Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 137,277	$ 67,192
Accounts receivable and unbilled receivables, net of allowances of $3,688 and $2,582, respectively	203,391	196,238
Inventories	105,813	100,868
Prepaid expenses	18,728	20,700
Other current assets	11,870	12,136
Total current assets	477,079	397,134
Property and equipment, net	54,877	51,500
Long-term investment in sales-type leases, net	21,494	17,082
Operating lease right-of-use assets	59,041	0
Goodwill	334,516	335,887
Intangible assets, net	129,163	143,686
Long-term deferred tax assets	30,607	15,197
Prepaid commissions	45,234	46,143
Other long-term assets	92,259	74,613
Total assets	1,244,270	1,081,242
Current liabilities:
Accounts payable	48,449	38,038
Accrued compensation	33,499	41,660
Accrued liabilities	58,017	43,047
Deferred revenues, net	88,205	81,835
Total current liabilities	228,170	204,580
Long-term deferred revenues	7,979	10,582
Long-term deferred tax liabilities	60,917	41,484
Long-term operating lease liabilities	52,738	0
Other long-term liabilities	9,798	9,562
Long-term debt, net	77,135	135,417
Total liabilities	436,737	401,625
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; 51,050 and 49,480 shares issued; 41,905 and 40,335 shares outstanding, respectively	51	50
Treasury stock at cost, 9,145 shares outstanding, respectively	(185,074)	(185,074)
Additional paid-in capital	770,260	678,041
Retained earnings	236,697	197,454
Accumulated other comprehensive loss	(14,401)	(10,854)
Total stockholders’ equity	807,533	679,617
Total liabilities and stockholders’ equity	$ 1,244,270	$ 1,081,242