Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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	117	57	$ 402	245
Other, income tax expense	$ 0	$ 56		$ 72