Comprehensive Income (Loss) (Schedule of 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
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net (loss) income	$ (10,143)	$ 15,406	$ (9,502)	$ 14,405
Pension and other postretirement benefits, net of tax	4,630	7,696	6,837	9,808
Derivative instruments, net of tax	2,009	686	1,477	1,300
Foreign currency translation	(6,116)	2,644	(2,679)	9,240
Total comprehensive income (loss)	$ (9,620)	$ 26,432	$ (3,867)	$ 34,753