Statements of Financial Position Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents, at Carrying Value	$ 47,628	$ 80,790
Marketable Securities, Current	114,857	86,582
Accounts Receivable, Net, Current	49,969	53,437
Inventory, Net	65,829	61,351
Prepaid Expense and Other Assets	23,774	14,804
Assets, Current	302,057	296,964
Property, Plant and Equipment, Net	12,244	13,058
Goodwill	22,495	22,553
Intangible Assets, Net (Excluding Goodwill)	9,557	11,464
Other Assets, Noncurrent	28,847	27,323
Assets	375,200	371,362
Accounts Payable and Accrued Liabilities	17,127	12,772
Other Liabilities, Current	18,743	18,918
Liabilities, Current	35,870	31,690
Convertible senior notes	53,997	51,751
Other Liabilities, Noncurrent	9,657	8,918
Liabilities	99,524	92,359
Commitments and Contingencies
Common Stock, Value, Issued	33	33
Additional Paid in Capital, Common Stock	418,417	415,739
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,666)	(1,795)
Retained Earnings (Accumulated Deficit)	(141,108)	(134,974)
Stockholders' Equity Attributable to Parent	275,676	279,003
Liabilities and Equity	$ 375,200	$ 371,362