Statement of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss) Attributable to Parent	$ 17,956	$ (4,640)	$ 3,458
Depreciation	3,951	4,686	4,150
Amortization of Financing Costs and Discounts	3,766	3,385	3,044
Amortization	2,145	2,427	2,786
Foreign Currency Transaction Loss (Gain), before tax	293	65	(8)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset	(630)	120	138
Share-based Compensation	7,603	6,242	4,106
Provision for doubtful accounts and inventory valuation	3,826	4,064	3,608
Increase (Decrease) in Deferred Income Taxes	3,980	(3,937)	(1,510)
Increase (Decrease) in Accounts Receivable	(4,336)	1,147	2,631
Increase (Decrease) in Income Taxes Receivable	2,610	1,196	(4,605)
Increase (Decrease) in Inventories	(12,529)	(9,393)	(6,758)
Increase (Decrease) in Prepaid Expense and Other Assets	953	(4,690)	1,383
Increase (Decrease) in Accounts Payable	2,254	3,758	(912)
Increase (Decrease) in Deferred Revenue	(1,535)	363	(1,655)
Increase (Decrease) in Other Operating Liabilities	3,486	(503)	(3,772)
Net Cash Provided by (Used in) Operating Activities	33,793	4,290	6,084
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Marketable Securities	(237,127)	(243,656)	(119,068)
Proceeds from Sale and Maturity of Marketable Securities	234,105	217,212	97,289
Payments to Acquire Property, Plant, and Equipment	(3,359)	(2,084)	(4,880)
Payments to Acquire Intangible Assets	(2,696)	0	0
Payments to Acquire Businesses, Net of Cash Acquired	0	0	(3,365)
Net Cash Provided by (Used in) Investing Activities	(9,077)	(28,528)	(30,024)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for (Proceeds from) Derivative Instrument, Financing Activities	(20,668)	(12,845)	0
Payments Related to Tax Withholding for Share-based Compensation	(1,916)	0	0
Proceeds from (Payments for) Other Financing Activities	(731)	(264)	(224)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	330	362	1,012
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	16	63	648
Net Cash Provided by (Used in) Financing Activities	(22,969)	(12,684)	1,436
Effect of Exchange Rate on Cash and Cash Equivalents	(307)	(754)	(959)
Cash and Cash Equivalents, Period Increase (Decrease)	1,440	(37,676)	(23,463)
Cash and Cash Equivalents, at Carrying Value	44,554	43,114	80,790
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid	2,013	1,067	5,492
Interest Paid	2,250	2,250	2,250
Payments for Legal Settlements	0	10,613	0
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	$ 3,000	$ 0	$ 0