Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Business Segments [Abstract]
Income for reportable segments	$ 12,438	$ (3,700)	$ 21,708	$ 2,536
Interest expense	(125)	(123)	(258)	(263)
Interest income	139	94	345	194
Other (expense)/income	137	121	315	606
LIFO income/(expense)	(14)	(53)	(254)	(99)
Equity in income of nonconsolidated investment	420	309	596	332
Corporate expense, cost of capital elimination and other unallocated charges	(1,900)	(1,238)	(3,913)	(3,403)
Income (loss) from continuing operations, before income taxes	$ 11,095	$ (4,590)	$ 18,539	$ (97)