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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]      
Changes in benefit obligations and plan assets for defined benefit and post retirement benefit plans, deferred income taxes $ (4) $ 146 $ 141
Unrealized gain on available for sale securities, deferred income taxes 289 885 60
Change in market value of interest rate swap, deferred income taxes $ (19) $ (140) $ (140)