Summary of Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Comprehensive Income Net Of Tax [Abstract]

Component of Comprehensive Income

There is no income tax expense or benefit associated with each component of comprehensive income. As of December 31, 2014, the accumulated balance for each component of comprehensive income is as follows:

	2014			2013
Translation adjustment	$	(32,683	)	$	(16,210	)
Unrealized loss on defined benefit plan	$	(35,719	)	$	(28,164	)

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

For the three years ended December 31, 2014, 2013 and 2012, options and share grants outstanding totaling approximately 2 million shares have been excluded from the computation of diluted earnings per share because their effect was anti-dilutive.

	Year Ended December 31,
	2014		2013		2012
Basic
Weighted average number of common shares outstanding used in computing basic earnings per share		47,184		46,363		45,780
Net income attributable to common stockholders	$	63,678	$	26,532	$	24,152
Basic earnings per share attributable to common stockholders	$	1.35	$	0.57	$	0.53
Diluted
Weighted average number of common shares outstanding used in computing basic earnings per share		47,184		46,363		45,780
Add:  Assumed exercise of stock options and stock awards		1,410		1,295		1,119
Weighted average number of common shares outstanding used in computing diluted earnings per share		48,594		47,658		46,899
Net income attributable to common stockholders	$	63,678	$	26,532	$	24,152
Diluted earnings per share attributable to common stockholders	$	1.31	$	0.56	$	0.51