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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net income $ 8,190 $ 10,526
Interest rate swaps:    
Adjustment for amortization of losses included in net income 83 83
Income tax expense (28) (28)
Post retirement benefit plan adjustments:    
Net actuarial (loss) gain (633) 1,479
Prior service costs (496) (496)
Income tax benefit (expense) 384 (374)
Comprehensive income $ 7,500 $ 11,190