Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Change in foreign currency translation adjustments
Balance at beginning of period	$ 14,656	$ 20,973	$ 12,635	$ 14,938
Other comprehensive income, net of tax	(3,687)	1,193	(1,666)	7,228
Balance at end of period	10,969	22,166	10,969	22,166
Change in pension liability adjustments, net of taxes
Balance at beginning of period	(9,399)	(5,097)	(9,642)	(5,127)
Other comprehensive income, net of tax	244	152	487	182
Balance at end of period	(9,155)	(4,945)	(9,155)	(4,945)
Change in accumulated other comprehensive income
Balance at beginning of period	5,257	15,876	2,993	9,811
Other comprehensive income, net of tax	(3,443)	1,345	(1,179)	7,410
Balance at end of period	$ 1,814	$ 17,221	$ 1,814	$ 17,221