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Accumulated Other Comprehensive Income (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 3,051,000 $ 3,761,000 $ 3,187,000 $ 3,877,000
Other comprehensive income before reclassifications 0 0    
Amounts reclassified from accumulated other comprehensive income, before tax (190,000) (191,000)    
Other Comprehensive Income (Loss), Tax 54,000 75,000    
Derivative [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax (34,000) (68,000) (54,000) (109,000)
Other comprehensive income before reclassifications 0 0    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 31,000 62,000    
Other Comprehensive Income (Loss), Tax (11,000) (21,000)    
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Accumulated Other Comprehensive Income (Loss), Net of Tax 3,085,000 3,829,000 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 (221,000) (253,000)    
Other Comprehensive Income (Loss), Tax $ 65,000 $ 96,000