CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 69,817	$ 62,313
Accounts receivable, net of allowances of $838 and $772 at March 31, 2013 and December 31, 2012, respectively	65,703	55,116
Inventories	26,125	26,903
Prepaid expenses	16,049	15,392
Deferred tax assets	11,860	11,860
Other current assets	7,532	9,172
Total current assets	197,086	180,756
Property and equipment, net	34,697	34,107
Non-current net investment in sales-type leases	12,943	13,228
Goodwill	111,343	111,407
Other intangible assets	84,529	85,550
Non-current deferred tax assets	1,126	993
Other assets	15,633	15,778
Total assets	457,357	441,819
Current liabilities:
Accounts payable	18,379	18,255
Accrued compensation	6,948	11,613
Accrued liabilities	12,525	11,988
Deferred service revenue	20,821	20,449
Deferred gross profit	26,938	20,772
Total current liabilities	85,611	83,077
Non-current deferred service revenue	19,463	19,892
Non-current deferred tax liabilities	25,548	26,491
Other long-term liabilities	4,942	4,809
Total liabilities	135,564	134,269
Stockholders' equity:
Total stockholders' equity	321,793	307,550
Total liabilities and stockholders' equity	$ 457,357	$ 441,819