Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred income tax assets:
Pension	$ 0	$ 16,526
Non-pension postretirement benefits	22,749	27,198
Other accrued liabilities	18,084	20,213
Receivables	1,467	1,445
Net operating loss and charitable contribution carry forwards	32,806	45,592
Tax credits	10,953	9,770
Total deferred income tax assets	86,059	120,744
Deferred income tax liabilities:
Property, plant and equipment	22,053	23,196
Inventories	4,762	4,377
Pension	3,031	0
Intangibles and other assets	10,238	12,392
Total deferred income tax liabilities	40,084	39,965
Net deferred income tax asset (liability):
Net deferred income tax asset before valuation allowance	45,975	80,779
Valuation allowance	(46,048)	(77,629)	(76,452)	(72,327)
Net deferred income tax asset (liability)	$ (73)	$ 3,150