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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,668,000 $ 4,651,000 $ 2,668,000 $ 4,651,000 $ 2,830,000 $ 4,872,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax (6,000) (6,000) (16,000) (16,000)    
Amounts reclassified from accumulated other comprehensive income, before tax     (230,000) (320,000)    
Other Comprehensive Income (Loss), Tax     68,000 99,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax (2,000) (2,000) (5,000) (6,000)    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax 24,000 35,000 73,000 105,000    
Derivative [Member]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (5,000) (20,000) (5,000) (20,000) (16,000) (30,000)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion       16,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax       (6,000)    
Other Postretirement Benefit Plans, Defined Benefit [Member]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,673,000 $ 4,671,000 2,673,000 4,671,000 $ 2,846,000 $ 4,902,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax     $ (246,000) (336,000)    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax       $ 105,000