Statements of Financial Position Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Cash and Cash Equivalents, at Carrying Value	$ 83,780	$ 104,253
Marketable Securities, Current	74,811	64,963
Accounts Receivable, Net, Current	58,733	57,113
Inventory, Net	65,939	57,948
Prepaid Expense and Other Assets	7,771	4,301
Assets, Current	291,034	288,578
Property, Plant and Equipment, Net	13,011	11,909
Goodwill	24,934	16,845
Intangible Assets, Net (Excluding Goodwill)	12,072	12,358
Other Assets, Noncurrent	34,640	34,894
Assets	375,691	364,584
Accounts Payable and Accrued Liabilities	17,575	15,696
Other Liabilities, Current	17,104	21,352
Liabilities, Current	34,679	37,048
Convertible senior notes	51,047	49,010
Other Liabilities, Noncurrent	13,889	8,037
Liabilities	99,615	94,095
Commitments and Contingencies
Common Stock, Value, Issued	33	32
Additional Paid in Capital, Common Stock	414,580	409,974
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,509)	(1,085)
Retained Earnings (Accumulated Deficit)	(137,028)	(138,432)
Stockholders' Equity Attributable to Parent	276,076	270,489
Liabilities and Equity	$ 375,691	$ 364,584