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Consolidated Condensed Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Product revenues $ 243,378 $ 232,720 $ 492,645 $ 448,434
Cost of sales 164,973 161,225 329,080 308,697
Gross margin 78,405 71,495 163,565 139,737
Operating expenses:        
Net research and development expenses 21,407 19,111 40,912 34,807
Acquisition transaction expenses   634   671
Selling, general and administrative expenses 31,775 29,397 62,581 52,021
Total operating expenses 53,182 49,142 103,493 87,499
Operating income 25,223 22,353 60,072 52,238
Interest expense (1,261) (950) (2,383) (1,627)
Foreign currency (loss) gain (13,251) 2,796 (14,580) 961
Other income 173 30 409 395
Earnings before income tax 10,884 24,229 43,518 51,967
Income tax expense 2,371 5,783 9,603 21,628
Net income $ 8,513 $ 18,446 $ 33,915 $ 30,339
Basic earnings per share $ 0.23 $ 0.51 $ 0.92 $ 0.83
Diluted earnings per share $ 0.23 $ 0.50 $ 0.92 $ 0.83
Weighted average number of shares – basic 36,776,545 36,442,296 36,698,618 36,399,635
Weighted average number of shares – diluted 36,840,371 36,637,218 36,796,168 36,572,230