Statements of Financial Position Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value	$ 32,984	$ 43,114
Marketable Securities, Current	122,270	113,871
Accounts Receivable, Net, Current	61,339	51,603
Inventory, Net	72,604	63,344
Deferred Tax Assets, Net, Current	8,986	8,986
Prepaid Expense and Other Assets	8,961	9,403
Assets, Current	307,144	290,321
Property, Plant and Equipment, Net	12,178	12,938
Goodwill	22,495	22,495
Intangible Assets, Net (Excluding Goodwill)	13,498	9,042
Other Assets, Noncurrent	31,281	31,841
Assets	386,596	366,637
Liabilities, Current [Abstract]
Accounts Payable and Accrued Liabilities	24,853	17,747
Convertible Debt, Current	57,251	0
Other Liabilities, Current	24,095	17,188
Liabilities, Current	106,199	34,935
Convertible senior notes	0	54,773
Other Liabilities, Noncurrent	10,554	9,601
Liabilities	$ 116,753	$ 99,309
Commitments and Contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Value, Issued	$ 31	$ 32
Additional Paid in Capital, Common Stock	397,082	409,562
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,729)	(2,652)
Retained Earnings (Accumulated Deficit)	(124,541)	(139,614)
Stockholders' Equity Attributable to Parent	269,843	267,328
Liabilities and Equity	$ 386,596	$ 366,637