Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 110,543	$ 155,859
Accounts receivable, net of allowance for doubtful accounts of $5,035 (2013) and $4,317 (2012)	89,558	79,869
Inventories, net	44,018	41,820
Prepaid expenses and other current assets	5,074	4,010
Current deferred income taxes	6,748	5,867
Restricted cash	13	13
Total current assets	255,954	287,438
Property and equipment, net	35,994	34,353
Intangible assets, net	121,492	108,377
Goodwill	277,690	240,314
Long term deferred income taxes	149	107
Other assets, net	6,375	6,853
Total assets	697,654	677,442
Current liabilities:
Current portion of capitalized lease obligations	178	174
Accounts payable	29,779	32,095
Accrued and other liabilities	29,257	24,789
Customer deposits	4,043	2,786
Deferred revenue	18,540	15,309
Total current liabilities	81,797	75,153
Long-term portion of capitalized lease obligations	7,395	7,443
Convertible senior notes, net	43,090	80,531
Deferred income tax liability	22,590	23,142
Other liabilities	10,133	10,840
Total liabilities	165,005	197,109
Commitments and Contingencies
Stockholders' equity:
Preferred Stock, authorized 5,000 shares, none issued
Common stock, $0.001 par value, authorized 120,000 shares; issued 93,218 (2013) and 89,783 (2012)	93	60
Additional paid-in capital	509,904	460,237
Treasury stock, at cost: 539 (2013) and 533 shares (2012)	(244)	(240)
Accumulated earnings	22,262	16,410
Accumulated other comprehensive income	634	3,866
Total stockholders' equity	532,649	480,333
Total liabilities and stockholders' equity	$ 697,654	$ 677,442