Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Product revenues	$ 223,818	$ 206,012	$ 644,168	$ 606,132
Cost of sales	148,892	144,427	436,967	426,765
Gross margin	74,926	61,585	207,201	179,367
Operating expenses:
Net research and development expenses	14,934	15,278	44,459	42,873
Acquisition transaction expenses				1,075
Selling, general and administrative	22,543	22,181	71,546	61,741
Total operating expenses	37,477	37,459	116,005	105,689
Operating income	37,449	24,126	91,196	73,678
Interest expense	(759)	(857)	(1,867)	(2,758)
Debt retirement expense		(730)		(730)
Revaluation of derivatives	(134)	294	(1,151)	(293)
Foreign currency gain (loss)	420	938	748	(905)
Gain from equity investment				785
Other income	487	369	944	169
Earnings before income tax	37,463	24,140	89,870	69,946
Income tax expense	9,798	6,852	22,891	19,656
Net income	$ 27,665	$ 17,288	$ 66,979	$ 50,290
Basic earnings per share	$ 0.77	$ 0.49	$ 1.86	$ 1.42
Diluted earnings per share	$ 0.76	$ 0.48	$ 1.84	$ 1.40
Weighted average number of shares – basic	36,110,360	35,522,407	35,951,430	35,317,359
Weighted average number of shares – diluted	36,481,711	36,271,280	36,390,042	35,942,811