Statements of Financial Position Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Cash and Cash Equivalents, at Carrying Value	$ 66,792	$ 104,253
Marketable Securities, Current	91,033	64,963
Accounts Receivable, Net, Current	61,065	57,113
Inventory, Net	72,056	63,422
Prepaid Expense and Other Assets	5,781	4,301
Assets, Current	296,727	294,052
Property, Plant and Equipment, Net	12,484	11,909
Goodwill	19,298	11,371
Intangible Assets, Net (Excluding Goodwill)	12,651	12,358
Other Assets, Noncurrent	34,810	34,894
Assets	375,970	364,584
Accounts Payable and Accrued Liabilities	19,198	15,696
Other Liabilities, Current	18,625	21,352
Liabilities, Current	37,823	37,048
Convertible senior notes	50,347	49,010
Other Liabilities, Noncurrent	13,952	8,037
Liabilities	102,122	94,095
Commitments and Contingencies
Common Stock, Value, Issued	32	32
Additional Paid in Capital, Common Stock	413,170	409,974
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,074)	(1,085)
Retained Earnings (Accumulated Deficit)	(137,280)	(138,432)
Stockholders' Equity Attributable to Parent	273,848	270,489
Liabilities and Equity	$ 375,970	$ 364,584