Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 7,466	$ 54,488
Accounts receivable, net of allowances of $5,279 and $4,796, respectively	171,869	150,303
Inventories	92,239	69,297
Prepaid expenses	28,044	28,646
Other current assets	15,763	12,674
Total current assets	315,381	315,408
Property and equipment, net	40,219	42,011
Long-term investment in sales-type leases, net	15,986	20,585
Goodwill	334,780	327,724
Intangible assets, net	174,227	190,283
Long-term deferred tax assets	5,629	4,041
Other long-term assets	37,596	35,051
Total assets	923,818	935,103
Current liabilities:
Accounts payable	51,182	27,069
Accrued compensation	27,380	26,722
Accrued liabilities	33,061	31,195
Long-term debt, current portion, net	13,410	8,410
Deferred revenue, net	80,837	87,516
Total current liabilities	205,870	180,912
Long-term deferred revenue	16,376	17,051
Long-term deferred tax liabilities	40,527	51,592
Other long-term liabilities	9,625	8,210
Long-term debt, net	178,923	245,731
Total liabilities	451,321	503,496
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; 47,064 and 45,778 shares issued; 37,919 and 36,633 shares outstanding, respectively	47	46
Treasury stock at cost, 9,145 shares outstanding	(185,074)	(185,074)
Additional paid-in capital	565,406	525,758
Retained earnings	98,294	100,396
Accumulated other comprehensive loss	(6,176)	(9,519)
Total stockholders’ equity	472,497	431,607
Total liabilities and stockholders’ equity	$ 923,818	$ 935,103