Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss) Attributable to Parent	$ 3,458	$ 43,865	$ 25,226
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Amortization	2,786	2,212	2,113
Amortization of Financing Costs and Discounts	3,044	2,736	1,129
Depreciation	4,150	3,680	4,210
Foreign Currency Transaction Gain (Loss), before Tax	(8)	482	(846)
Increase (Decrease) in Marketable Securities, Restricted	0	0	(1)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset	138	0	0
Share-based Compensation	4,106	4,001	4,802
Provision for doubtful accounts and inventory valuation	3,608	3,263	1,278
Increase (Decrease) in Deferred Income Taxes	(1,510)	(20,814)	(9,018)
Increase (Decrease) in Accounts Receivable	2,631	(14,743)	17,958
Increase (Decrease) in Income Taxes Receivable	(4,605)	3,547	(529)
Increase (Decrease) in Inventories	(6,758)	(6,701)	(35)
Increase (Decrease) in Prepaid Expense and Other Assets	1,383	(1,365)	(4,389)
Increase (Decrease) in Accounts Payable	(912)	(2,735)	(3,427)
Increase (Decrease) in Deferred Revenue	(2,393)	3,648	(1,330)
Increase (Decrease) in Other Operating Liabilities	(3,034)	991	8,303
Net Cash Provided by (Used in) Operating Activities	6,084	22,067	45,444
Payments to Acquire Marketable Securities	(119,068)	(96,309)	(81,004)
Proceeds from Sale and Maturity of Marketable Securities	97,289	102,384	11,418
Payments to Acquire Property, Plant, and Equipment	(4,880)	(2,429)	(1,622)
Payments to Acquire Businesses, Net of Cash Acquired	(3,365)	(18,580)	0
Net Cash Provided by (Used in) Investing Activities	(30,024)	(14,934)	(71,208)
Proceeds from Convertible Debt	0	0	57,749
Proceeds from Issuance of Warrants	0	0	7,007
Payments for (Proceeds from) Derivative Instrument, Financing Activities	0	0	(14,507)
Proceeds from (Payments for) Other Financing Activities	(224)	0	0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	1,012	257	257
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	648	211	528
Net Cash Provided by (Used in) Financing Activities	1,436	468	51,034
Effect of Exchange Rate on Cash and Cash Equivalents	(959)	(19)	281
Cash and Cash Equivalents, Period Increase (Decrease)	(23,463)	7,582	25,551
Cash and Cash Equivalents, at Carrying Value	80,790	104,253	96,671
Income Taxes Paid	5,492	2,402	2,454
Interest Paid	$ 2,250	$ 2,188	$ 0