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Accumulated Other Comprehensive Income (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 3,099,000 $ 3,799,000 $ 3,187,000 $ 3,877,000
Other comprehensive income before reclassifications 0 0    
Amounts reclassified from accumulated other comprehensive income, before tax (122,000) (128,000)    
Other Comprehensive Income (Loss), Tax 34,000 50,000    
Derivative [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax (38,000) (82,000) (54,000) (109,000)
Other comprehensive income before reclassifications 0 0    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 25,000 41,000    
Other Comprehensive Income (Loss), Tax (9,000) (14,000)    
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax 3,137,000 3,881,000 3,241,000 3,986,000
Other comprehensive income before reclassifications 0 0    
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax (147,000) (169,000)    
Other Comprehensive Income (Loss), Tax $ 43,000 $ 64,000