Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Currency translation adjustments, income tax expense	$ 0	$ 0	$ 0	$ 0
Change in unrecognized net periodic pension costs, income tax benefit	141	285	90	186
Other, income tax expense	$ 0	$ 0	$ 8	$ 16