Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 22,207	$ 19,072
Unrealized gain on hedging activities, net of tax of $84 and $198, respectively	236	288
Foreign currency translation adjustments, net of tax of $717 and $1,493, respectively	14,709	18,146
Defined benefit pension and other postretirement benefits, net of tax of $1,017 and $425, respectively	1,205	322
Total other comprehensive income, net of tax	16,150	18,756
Total comprehensive income	$ 38,357	$ 37,828