Income Taxes (Deferred Income Taxes Components) (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Income Taxes [Abstract]
Accrued postretirement benefits	$ 25,287	$ 28,525
Other benefit obligations	123,306	112,646
Accounts receivable	31,073	28,047
State income tax loss carryforwards	34,578	34,506
U.S. Federal income tax loss carryforwards	2,857	6,301
U.S. Federal capital loss carryforwards	10,837	0
U.S Federal foreign income tax credit carryforwards	6,781	0
Non-U.S. income tax loss carryforwards	27,039	14,906
Other	58,133	60,881
Deferred tax assets	319,891	285,812
Valuation allowance	(78,109)	(59,179)
Deferred tax assets, net	241,782	226,633
Property, plant and equipment	175,025	200,054
Prepaid pension cost	241,846	213,663
Unrealized gain on available-for-sale securities	73,712	53,588
Goodwill and other intangible assets	276,652	291,346
Deferred tax liabilities	767,235	758,651
Deferred income tax liabilities, net	$ 525,453	$ 532,018