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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,722,000 $ 4,724,000 $ 2,722,000 $ 4,724,000 $ 2,830,000 $ 4,872,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax (6,000) (5,000) (11,000) (10,000)    
Amounts reclassified from accumulated other comprehensive income, before tax     (153,000) (214,000)    
Other Comprehensive Income (Loss), Tax     45,000 66,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax (2,000) (2,000) (4,000) (4,000)    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax 24,000 35,000 49,000 70,000    
Derivative [Member]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (9,000) (24,000) (9,000) (24,000) (16,000) (30,000)
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion       10,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax       (4,000)    
Other Postretirement Benefit Plans, Defined Benefit [Member]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,731,000 $ 4,748,000 2,731,000 4,748,000 $ 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     $ (164,000) (224,000)    
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax       $ 70,000