Statements of Cash Flows Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) Attributable to Parent	$ 13,939	$ 1,848
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Amortization	595	515
Amortization of Financing Costs and Discounts	1,017	914
Depreciation	944	898
Foreign Currency Transaction Gain (Loss), before Tax	107	638
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset	117	(396)
Share-based Compensation	1,161	4,410
Provision for doubtful accounts and inventory valuation	800	923
Gain (Loss) Related to Litigation Settlement	(14,632)	0
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(10,371)	1,281
Net Cash Provided by (Used in) Operating Activities	(6,323)	11,031
Net Cash Provided by (Used in) Investing Activities [Abstract]
Payments to Acquire Marketable Securities	(44,311)	(60,458)
Proceeds from Sale and Maturity of Marketable Securities	51,120	51,381
Payments to Acquire Property, Plant, and Equipment	(1,514)	(1,072)
Net Cash Provided by (Used in) Investing Activities	5,295	(10,149)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Payments for Repurchase of Common Stock	(4,700)	(6,786)
Payments Related to Tax Withholding for Share-based Compensation	(1,509)	(1,868)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	6	61
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	304	93
Net Cash Provided by (Used in) Financing Activities	(5,899)	(8,500)
Effect of Exchange Rate on Cash and Cash Equivalents	559	(131)
Cash and Cash Equivalents, Period Increase (Decrease)	(6,368)	(7,749)
Cash and Cash Equivalents, at Carrying Value	38,186	35,365
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid	1,068	356
Interest Paid	$ 1,125	$ 1,125