Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 26,936	$ 54,488
Accounts receivable, net of allowances of $5,019 and $4,796, respectively	151,010	150,303
Inventories	81,523	69,297
Prepaid expenses	26,001	28,646
Other current assets	10,511	12,674
Total current assets	295,981	315,408
Property and equipment, net	40,713	42,011
Long-term investment in sales-type leases, net	17,424	20,585
Goodwill	332,996	327,724
Intangible assets, net	180,206	190,283
Long-term deferred tax assets	5,627	4,041
Other long-term assets	36,954	35,051
Total assets	909,901	935,103
Current liabilities:
Accounts payable	53,287	27,069
Accrued compensation	31,251	26,722
Accrued liabilities	30,894	31,195
Long-term debt, current portion, net	10,910	8,410
Deferred revenue, net	85,370	87,516
Total current liabilities	211,712	180,912
Long-term deferred revenue	16,332	17,051
Long-term deferred tax liabilities	38,950	51,592
Other long-term liabilities	9,879	8,210
Long-term debt, net	183,526	245,731
Total liabilities	460,399	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; 46,591 and 45,778 shares issued; 37,446 and 36,633 shares outstanding, respectively	46	46
Treasury stock at cost, 9,145 shares outstanding	(185,074)	(185,074)
Additional paid-in capital	549,958	525,758
Retained earnings	92,063	100,396
Accumulated other comprehensive loss	(7,491)	(9,519)
Total stockholders’ equity	449,502	431,607
Total liabilities and stockholders’ equity	$ 909,901	$ 935,103