CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Products	$ 172,001	$ 160,485
Services	32,072	32,670
Total revenues	204,073	193,155
Cost and expenses:
Products	91,331	96,673
Services	19,456	19,655
Total cost of sales	110,787	116,328
Selling, general and administrative	23,935	15,629
Engineering and product development	10,784	9,021
Total costs and expenses	145,506	140,978
Operating income	58,567	52,177
Interest income	83	116
Interest expense	(7)	(14)
Income before income taxes	58,643	52,279
Income tax provision	16,025	12,437
Net income	$ 42,618	$ 39,842
Earnings per common share:
Basic	$ 1.05	$ 0.98
Diluted	$ 1.04	$ 0.98
Weighted average common shares outstanding:
Basic	40,678	40,529
Diluted	40,887	40,713