Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 244,953	$ 349,051
Accounts receivable and unbilled receivables, net of allowances of $4,752 and $5,272, respectively	310,520	240,894
Inventories	150,461	119,924
Prepaid expenses	20,856	22,499
Other current assets	60,980	48,334
Total current assets	787,770	780,702
Property and equipment, net	81,834	71,141
Long-term investment in sales-type leases, net	29,209	18,391
Operating lease right-of-use assets	46,240	48,549
Goodwill	734,487	738,900
Intangible assets, net	260,159	277,616
Long-term deferred tax assets	16,134	15,883
Prepaid commissions	57,762	63,795
Other long-term assets	117,863	127,519
Total assets	2,131,458	2,142,496
Current liabilities:
Accounts payable	68,400	71,513
Accrued compensation	60,012	71,130
Accrued liabilities	136,523	133,167
Deferred revenues, net	108,579	112,196
Convertible senior notes, net	0	488,152
Total current liabilities	373,514	876,158
Long-term deferred revenues	24,187	20,194
Long-term deferred tax liabilities	23,906	51,705
Long-term operating lease liabilities	43,371	39,911
Other long-term liabilities	8,808	7,839
Convertible senior notes, net	565,035	0
Total liabilities	1,038,821	995,807
Commitments and contingencies (Note 13)
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; 54,571 and 54,073 shares issued; 44,288 and 44,179 shares outstanding, respectively	55	54
Treasury stock at cost, 10,283 and 9,894 shares outstanding, respectively	(290,319)	(238,109)
Additional paid-in capital	997,911	1,024,580
Retained earnings	402,362	368,571
Accumulated other comprehensive loss	(17,372)	(8,407)
Total stockholders’ equity	1,092,637	1,146,689
Total liabilities and stockholders’ equity	$ 2,131,458	$ 2,142,496