Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 8,479	$ 4,277
Other comprehensive income (loss):
Foreign currency translation adjustment (net of tax of $125 in 2014 and tax benefit of $634 in 2013)	5,095	865
Derivative financial instruments adjustment (net of tax of $117 in 2014 and tax benefit of $299 in 2013)	192	(518)
Amortization of prior service costs and net gains or losses (net of tax of $997 in 2014 and $1,336 in 2013)	1,740	2,313
Other comprehensive income	7,027	2,660
Comprehensive income	$ 15,506	$ 6,937