Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 7,281	$ 9,870
Other comprehensive income (loss):
Foreign currency translation adjustment	12,579	(34,653)
Derivative financial instruments adjustment	262	(662)
Amortization of prior service costs and net gains or losses	2,482	2,522
Other comprehensive income (loss)	15,323	(32,793)
Comprehensive income (loss)	$ 22,604	$ (22,923)