Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Change in foreign currency translation adjustments
Balance at beginning of period	$ 12,635	$ 14,938
Other comprehensive income, net of tax	2,021	6,035
Balance at end of period	14,656	20,973
Change in pension liability adjustments, net of taxes
Balance at beginning of period	(9,642)	(5,127)
Other comprehensive income, net of tax	243	30
Balance at end of period	(9,399)	(5,097)
Change in accumulated other comprehensive income
Balance at beginning of period	2,993	9,811
Other comprehensive income, net of tax	2,264	6,065
Balance at end of period	$ 5,257	$ 15,876