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AOCI (Tables)
 12 Months Ended
Dec. 31, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of accumulated other comprehensive income
 
Hedging Derivative Activities
 
Post Retirement Benefit Plan Items(A)
 
Total
2017:
 
 
 
 
 
Balance at January 1, 2017
$
(200,000
)
 
$
2,614,000

 
$
2,414,000

Other comprehensive income before reclassifications
517,000

 
(417,000
)
 
100,000

Amounts reclassified from accumulated other comprehensive income
(512,000
)
 
(347,000
)
 
(859,000
)
Income tax (expense) benefit
(2,000
)
 
255,000

 
253,000

Adoption of Accounting Standards Update 2018-02
—

 
162,000

 
162,000

Balance at December 31, 2017
$
(197,000
)
 
$
2,267,000

 
$
2,070,000

 
 
 
 
 
 
2018:
 
 
 
 
 
Balance at January 1, 2018
$
(197,000
)
 
$
2,267,000

 
$
2,070,000

Other comprehensive income before reclassifications
(608,000
)
 
910,000

 
302,000

Amounts reclassified from accumulated other comprehensive income
91,000

 
(325,000
)
 
(234,000
)
Income tax (expense) benefit
102,000

 
(123,000
)
 
(21,000
)
Balance at December 31, 2018
$
(612,000
)
 
$
2,729,000

 
$
2,117,000