Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Change in foreign currency translation adjustments
Balance at beginning of period	$ 10,969	$ 22,166	$ 12,635	$ 14,938
Other comprehensive income, net of tax	2,299	(11,137)	633	(3,909)
Balance at end of period	13,268	11,029	13,268	11,029
Change in pension liability adjustments, net of taxes
Balance at beginning of period	(9,155)	(4,945)	(9,642)	(5,127)
Other comprehensive income, net of tax	244	91	731	273
Balance at end of period	(8,911)	(4,854)	(8,911)	(4,854)
Change in accumulated other comprehensive income (loss)
Balance at beginning of period	1,814	17,221	2,993	9,811
Other comprehensive income (loss), net of tax	2,543	(11,046)	1,364	(3,636)
Balance at end of period	$ 4,357	$ 6,175	$ 4,357	$ 6,175