CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Products	$ 91,592	$ 135,194
Services	27,636	31,367
Total revenues	119,228	166,561
Cost of sales:
Products	66,462	76,922
Services	15,978	16,174
Total cost of sales	82,440	93,096
Selling, general and administrative	25,808	13,221
Engineering and product development	11,850	10,901
Total costs and expenses	120,098	117,218
Operating income (loss)	(870)	49,343
Interest income	937	482
Interest expense	(15)	(4)
Income before income taxes	52	49,821
Income tax provision (benefit)	(42)	13,052
Net income	$ 94	$ 36,769
Earnings per common share:
Basic (in dollars per share)	$ 0.00	$ 0.97
Diluted (in dollars per share)	$ 0.00	$ 0.97
Weighted average common shares outstanding:
Basic (in shares)	37,525	37,752
Diluted (in shares)	37,693	37,847