Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Significant Accounting Policies

Schedule of estimated useful lives of the related assets

Asset Classification	Estimated Useful Life
Land and buildings (under lease)		Lesser of the lease term or estimated useful life of the asset
Machinery and equipment		7 to 10 years

Schedule of components of net income per share

	Year ended December 31,
	2017		2016		2015
	(in thousands, except per share data)
Net income available to common stockholders	$	126,959	$	11,001	$	14,678
Weighted average common shares outstanding used in computing basic income per share		30,866		29,195		28,595
Incremental options and RSUs		2,570		1,752		1,634
Weighted average common shares used in computing diluted net income per share		33,436		30,947		30,229
Net income per share
Basic	$	4.11	$	0.38	$	0.51
Diluted	$	3.80	$	0.36	$	0.49

Schedule of changes in accumulated other comprehensive income, net of tax

	Foreign		Defined benefit
	currency		pension plan		Total
	(in thousands)
Balance at December 31, 2016	$	(1,591)	$	(688)	$	(2,279)
Other comprehensive income and pension reclassification		4,347		108		4,455
Balance at December 31, 2017	$	2,756	$	(580)	$	2,176