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Accumulated Other Comprehensive Income (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 3,148,000 $ 3,837,000 $ 3,187,000 $ 3,877,000
Other comprehensive income before reclassifications 0 0    
Amounts reclassified from accumulated other comprehensive income, before tax (53,000) (65,000)    
Other Comprehensive Income (Loss), Tax 14,000 25,000    
Derivative [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax (40,000) (96,000) (54,000) (109,000)
Other comprehensive income before reclassifications 0 0    
Losses on interest rate swaps - amounts reclassified from accumulated other comprehensive income 21,000 20,000    
Other Comprehensive Income (Loss), Tax (7,000) (7,000)    
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax 3,188,000 3,933,000 3,241,000 3,986,000
Other comprehensive income before reclassifications 0 0    
Post retirement benefit plan items - amounts reclassified from accumulated other comprehensive income (74,000) (85,000)    
Other Comprehensive Income (Loss), Tax $ 21,000 $ 32,000