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Business Segments (Reconciliation of Operating Profit (Loss) from Segments to Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Business Segments [Abstract]    
Income for reportable segments $ 7,118 $ 9,270
Interest expense (123) (133)
Interest income 144 206
Other income 135 178
LIFO expense (4) (240)
Equity in income of nonconsolidated investment 204 176
Corporate expense, cost of capital elimination and other unallocated charges (2,153) (2,013)
Income from continuing operations before income taxes $ 5,321 $ 7,444