Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Segments [Abstract]
Income for reportable segments	$ 13,553	$ 14,770	$ 35,261	$ 17,306
Interest expense	(118)	(141)	(376)	(405)
Interest income	149	126	494	319
Other (expense)/income	638	(612)	953	(4)
LIFO income/(expense)	553	432	299	333
Equity in income of nonconsolidated investment	296	310	892	643
Corporate expense, cost of capital elimination and other unallocated charges	(1,049)	(1,774)	(4,962)	(5,178)
Income (loss) from continuing operations, before income taxes	$ 14,022	$ 13,111	$ 32,561	$ 13,014