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AOCI (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,830,000 $ 4,872,000
Other comprehensive income before reclassifications 48,000 (2,726,000)
Amounts reclassified from accumulated other comprehensive income, before tax (306,000) (428,000)
Other Comprehensive Income (Loss), Tax 73,000 1,112,000
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,645,000 2,830,000
Derivative [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax (16,000) (30,000)
Other comprehensive income before reclassifications 0 0
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion 21,000 21,000
Other Comprehensive Income (Loss), Tax (8,000) (7,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax (3,000) (16,000)
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,846,000 4,902,000
Other comprehensive income before reclassifications 48,000 (2,726,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax (327,000) (449,000)
Other Comprehensive Income (Loss), Tax 81,000 1,119,000
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,648,000 $ 2,846,000