Pensions and Other Postretirement Benefit Plans (Schedule of Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 37,200
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	262,376	247,072
Actual return on plan assets, net of expenses	34,176	21,936
Employer contributions	37,174	22,075
Plan participants' contributions	387	378
Benefits paid	(26,562)	(23,956)
Settlements	(891)	(5,722)
Removal of defined contribution component		(1,710)
Foreign currency changes	(2,002)	2,303
Fair value of plan assets, end of year	304,658	262,376
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year
Actual return on plan assets, net of expenses
Employer contributions	5,823	6,653
Plan participants' contributions	1,319	607
Benefits paid	(7,142)	(7,260)
Settlements
Removal of defined contribution component
Foreign currency changes
Fair value of plan assets, end of year