Geographic and Significant Customer Information (Notes)

12 Months Ended

Dec. 31, 2016

Segment Reporting Information [Line Items]

Segment Reporting Disclosure [Text Block]

We have operations in the United States, Europe and Asia. Our disclosure related to sales and long-lived assets by geographic area and information relating to major customers are presented below. Sales attributed to individual countries are based on customer location.

	Years Ended December 31,
	2016				2015				2014
Sales to external customers:
United States	$	327,397	67.7	%	$	268,257	64.7	%	$	230,843	62.8	%
Canada	161		—	%	195		—	%	347		0.1	%
North America	327,558		67.7	%	268,452		64.7	%	231,190		62.9	%
People's Republic of China	16,207		3.4	%	12,687		3.1	%	12,903		3.5	%
Other Asian countries	77,638		16.1	%	61,839		15.0	%	56,938		15.5	%
Asia	93,845		19.5	%	74,526		18.0	%	69,841		19.0	%
Germany	48,589		10.0	%	46,719		11.3	%	43,343		11.8	%
United Kingdom	13,712		2.8	%	25,100		6.0	%	22,670		6.2	%
Other European countries	—		—	%	14		—	%	289		—	%
Europe	62,301		12.8	%	71,833		17.3	%	66,302		18.0	%
Total sales	$	483,704	100.0	%	$	414,811	100.0	%	$	367,333	100.0	%

Sales to Applied Materials Inc., our largest customer, were $170.2 million or 35.2% of total sales for 2016, $123.5 million, or 29.8% of total sales, for 2015 and $109.3 million, or 29.8% of total sales for 2014. Sales to Lam Research were $100.3 million or 20.7% of total sales for 2016, $84.2 million, or 20.3% of total sales, for 2015 and $73.0 million, or 19.9% of total sales for 2014. Our sales to Applied Materials and Lam Research include precision power products used in semiconductor processing and solar, flat panel display, and architectural glass applications. No other customer accounted for 10% or more of our sales during these periods.

	December 31,
	2016		2015
*Long lived assets:
United States	$	33,652	$	31,556
Asia	3,596		3,134
Europe	46,285		51,825
	$	83,533	$	86,515

* Long-lived assets include property and equipment, goodwill and other intangible assets.