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Consolidated Condensed Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Product revenues $ 232,720 $ 213,441 $ 448,434 $ 420,350
Cost of sales 161,225 147,736 308,697 288,075
Gross margin 71,495 65,705 139,737 132,275
Operating expenses:        
Net research and development expenses 19,111 14,977 34,807 29,525
Acquisition transaction expenses 634   671  
Selling, general and administrative expenses 29,397 24,058 52,021 49,003
Total operating expenses 49,142 39,035 87,499 78,528
Operating income 22,353 26,670 52,238 53,747
Interest expense (950) (544) (1,627) (1,108)
Revaluation of derivatives   (53)   (1,017)
Foreign currency gain (loss) 2,796 (107) 961 328
Other income 30 262 395 457
Earnings before income tax 24,229 26,228 51,967 52,407
Income tax expense 5,783 6,734 21,628 13,093
Net income $ 18,446 $ 19,494 $ 30,339 $ 39,314
Basic earnings per share $ 0.51 $ 0.54 $ 0.83 $ 1.10
Diluted earnings per share $ 0.50 $ 0.53 $ 0.83 $ 1.08
Weighted average number of shares – basic 36,442,296 35,970,992 36,399,635 35,870,649
Weighted average number of shares – diluted 36,637,218 36,584,850 36,572,230 36,428,507