Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 44,174	$ 32,424
Accounts receivable and unbilled receivables, net of allowances of $3,508 and $5,738, respectively	206,225	190,046
Inventories	99,231	96,137
Prepaid expenses	19,618	20,392
Other current assets	9,871	13,273
Total current assets	379,119	352,272
Property and equipment, net	50,484	42,595
Long-term investment in sales-type leases, net	17,448	15,435
Goodwill	336,517	337,751
Intangible assets, net	149,968	168,107
Long-term deferred tax assets	9,450	9,454
Prepaid commissions	40,441	41,432
Other long-term assets	68,948	49,316
Total assets	1,052,375	1,016,362
Current liabilities:
Accounts payable	38,367	48,290
Accrued compensation	32,953	27,241
Accrued liabilities	35,777	35,693
Long-term debt, current portion, net	17,708	15,208
Deferred revenues, net	87,777	78,774
Total current liabilities	212,582	205,206
Long-term deferred revenues	10,634	10,623
Long-term deferred tax liabilities	32,593	41,446
Other long-term liabilities	10,192	9,829
Long-term debt, net	167,135	194,917
Total liabilities	433,136	462,021
Commitments and contingencies (Note 10)
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; 48,760 and 47,577 shares issued; 39,615 and 38,432 shares outstanding, respectively	49	48
Treasury stock at cost, 9,145 shares outstanding	(185,074)	(185,074)
Additional paid-in capital	630,687	585,755
Retained earnings	182,661	159,725
Accumulated other comprehensive loss	(9,084)	(6,113)
Total stockholders’ equity	619,239	554,341
Total liabilities and stockholders’ equity	$ 1,052,375	$ 1,016,362