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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Fair value adjustment, tax $ 182 $ 36
Hedge de-designation , tax   216
Interest rate swap termination , tax   95
Net loss arising from retirement benefit obligations, tax 791  
Amortization of loss included in net income, tax $ 18