Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,408	$ 594	$ 10,690	$ 10,464
Other comprehensive income (loss):
Foreign currency translation adjustment	11,069	5,557	23,648	(29,096)
Derivative financial instruments adjustment	755	(979)	1,017	(1,641)
Amortization of prior service costs and net gains or losses	2,125	2,523	4,607	5,045
Other comprehensive income (loss)	13,949	7,101	29,272	(25,692)
Comprehensive income (loss)	$ 17,357	$ 7,695	$ 39,962	$ (15,228)