Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ (2,396)	$ 233	$ 897
Derivative financial instruments adjustment, tax (benefit)	(112)	(133)	818
Net gains or losses and prior service costs, tax (benefit)	(22,445)	13,231	(11,145)
Amortization of prior service costs and net gains or losses, tax	$ 3,582	$ 5,398	$ 3,749