Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 139,553	$ 125,888
Accounts receivable, net of allowances of $1,226 and $1,279, respectively	88,107	82,763
Inventories, net	33,190	31,554
Prepaid expenses	16,811	23,518
Deferred tax assets	12,444	12,446
Other current assets	6,217	7,215
Total current assets	296,322	283,384
Property and equipment, net	34,373	36,178
Long-term net investment in sales-type leases	10,443	10,848
Goodwill	122,216	122,720
Intangible assets, net	81,279	82,667
Long-term deferred tax assets	1,330	1,144
Other long-term assets	24,963	23,273
Total assets	570,926	560,214
Current liabilities:
Accounts payable	21,812	19,432
Accrued compensation	17,064	19,874
Accrued liabilities	22,113	19,299
Deferred service revenue	23,301	25,167
Deferred gross profit	24,334	28,558
Total current liabilities	108,624	112,330
Long-term deferred service revenue	19,841	20,308
Long-term deferred tax liabilities	30,999	30,454
Other long-term liabilities	6,012	7,024
Total liabilities	165,476	170,116
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 100,000 shares authorized; 43,930 and 43,540 shares issued; 36,211 and 35,816 shares outstanding, respectively	44	43
Treasury stock, at cost, 7,721 shares outstanding	(135,053)	(135,053)
Additional paid-in capital	476,405	457,436
Retained earnings	66,292	69,033
Accumulated other comprehensive income	(2,238)	(1,361)
Total stockholders’ equity	405,450	390,098
Total liabilities and stockholders’ equity	$ 570,926	$ 560,214