Business Segments (Reconciliation of Reportable Segment Net Profit) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Business Segments [Abstract]
Income for reportable segments	$ 9,270	$ 6,236
Interest expense	(133)	(139)
Interest income	206	100
Other (expense)/income	178	486
LIFO income/(expense)	(240)	(45)
Equity in income of nonconsolidated investment	176	23
Corporate expense and other unallocated charges	(2,013)	(2,168)
Corporate Expense And Other Unallocated Charges	2,013	2,168
Income from continuing operations, before income taxes	$ 7,444	$ 4,493