Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 77,244	$ 67,192
Accounts receivable and unbilled receivables, net of allowances of $3,881 and $2,582, respectively	203,489	196,238
Inventories	103,909	100,868
Prepaid expenses	17,048	20,700
Other current assets	12,017	12,136
Total current assets	413,707	397,134
Property and equipment, net	52,039	51,500
Long-term investment in sales-type leases, net	19,469	17,082
Operating lease right-of-use assets	63,851	0
Goodwill	336,119	335,887
Intangible assets, net	138,893	143,686
Long-term deferred tax assets	32,043	15,197
Prepaid commissions	43,669	46,143
Other long-term assets	77,270	74,613
Total assets	1,177,060	1,081,242
Current liabilities:
Accounts payable	38,466	38,038
Accrued compensation	29,056	41,660
Accrued Liabilities	52,996	43,047
Deferred revenues, net	90,104	81,835
Total current liabilities	210,622	204,580
Long-term deferred revenues	10,302	10,582
Long-term deferred tax liabilities	61,405	41,484
Long-term operating lease liabilities	57,470	0
Other long-term liabilities	9,786	9,562
Long-term debt, net	96,990	135,417
Total liabilities	446,575	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; 50,351 and 49,480 shares issued; 41,206 and 40,335 shares outstanding, respectively	50	50
Treasury stock at cost, 9,145 shares outstanding, respectively	(185,074)	(185,074)
Additional paid-in capital	725,273	678,041
Retained earnings	200,738	197,454
Accumulated other comprehensive loss	(10,502)	(10,854)
Total stockholders’ equity	730,485	679,617
Total liabilities and stockholders’ equity	$ 1,177,060	$ 1,081,242