Statements of Financial Position Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Cash and Cash Equivalents, at Carrying Value	$ 54,658	$ 80,790
Marketable Securities, Current	122,643	86,582
Accounts Receivable, Net, Current	50,811	53,437
Inventory, Net	65,624	61,351
Prepaid Expense and Other Assets	22,204	14,804
Assets, Current	315,940	296,964
Property, Plant and Equipment, Net	11,837	13,058
Goodwill	22,495	22,553
Intangible Assets, Net (Excluding Goodwill)	10,124	11,464
Other Assets, Noncurrent	28,685	27,323
Assets	389,081	371,362
Accounts Payable and Accrued Liabilities	16,347	12,772
Other Liabilities, Current	33,509	18,918
Liabilities, Current	49,856	31,690
Convertible senior notes	53,225	51,751
Other Liabilities, Noncurrent	9,403	8,918
Liabilities	112,484	92,359
Commitments and Contingencies
Common Stock, Value, Issued	33	33
Additional Paid in Capital, Common Stock	418,215	415,739
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,541)	(1,795)
Retained Earnings (Accumulated Deficit)	(140,110)	(134,974)
Stockholders' Equity Attributable to Parent	276,597	279,003
Liabilities and Equity	$ 389,081	$ 371,362