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Changes in Accumulated Other Comprehensive Income by Component
 12 Months Ended
Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Changes in Accumulated Other Comprehensive Income by Component
Changes in Accumulated Other Comprehensive Income by Component
 
The following tables explain the changes in accumulated OCI by component for the years ended December 31, 2017, 2016, and 2015:

 
 
Year Ended December 31, 2017
 
 
Natural gas cash
flow hedges, net
of tax
 
 
 
Interest rate
cash flow
hedges, net
of tax
 
 
 
Pension and
other post-
retirement
benefits
liability
adjustment,
net of tax
 
 
 
Accumulated
OCI (loss), net
of tax
 
 
(Thousands)
Accumulated OCI (loss), net of tax, as of December 31, 2016
 
$
9,607

 
 
 
$
(699
)
 
 
 
$
(6,866
)
 
 
 
$
2,042

(Gains) losses reclassified from accumulated OCI, net of tax
 
(4,982
)
 
(a)
 
144

 
(a)
 
338

 
(b)
 
(4,500
)
Accumulated OCI (loss), net of tax, as of December 31, 2017
 
$
4,625

 
 
 
$
(555
)
 
 
 
$
(6,528
)
 
 
 
$
(2,458
)

 
 
Year Ended December 31, 2016
 
 
Natural gas cash
flow hedges, net
of tax
 
 
 
Interest rate
cash flow
hedges, net
of tax
 
 
 
Pension and
other post-
retirement
benefits
liability
adjustment,
net of tax
 
 
 
Accumulated
OCI (loss), net
of tax
 
 
(Thousands)
Accumulated OCI (loss), net of tax, as of December 31, 2015
 
$
64,762

 
 
 
$
(843
)
 
 
 
$
(17,541
)
 
 
 
$
46,378

(Gains) losses reclassified from accumulated OCI, net of tax
 
(55,155
)
 
(a)
 
144

 
(a)
 
10,675

 
(b)
 
(44,336
)
Accumulated OCI (loss), net of tax, as of December 31, 2016
 
$
9,607

 
 
 
$
(699
)
 
 
 
$
(6,866
)
 
 
 
$
2,042


 
 
Year Ended December 31, 2015
 
 
Natural gas cash
flow hedges, net
of tax
 
 
 
Interest rate
cash flow
hedges, net
of tax
 
 
 
Pension and
other post-
retirement
benefits
liability
adjustment,
net of tax
 
 
 
Accumulated
OCI (loss), net
of tax
 
 
(Thousands)
Accumulated OCI (loss), net of tax, as of December 31, 2014
 
$
217,121

 
 
 
$
(987
)
 
 
 
$
(16,640
)
 
 
 
$
199,494

(Gains) losses reclassified from accumulated OCI, net of tax
 
(152,359
)
 
(a)
 
144

 
(a)
 
(901
)
 
(b)
 
(153,116
)
Accumulated OCI (loss), net of tax, as of December 31, 2015
 
$
64,762

 
 
 
$
(843
)
 
 
 
$
(17,541
)
 
 
 
$
46,378


(a)     Gains (losses) reclassified from accumulated OCI, net of tax related to natural gas cash flow hedges were reclassified into operating revenues. Losses from accumulated OCI, net of tax related to interest rate cash flow hedges were reclassified into interest expense.

(b)       This accumulated OCI reclassification is attributable to the net actuarial loss and net prior service cost related to the Company’s defined benefit pension plans and other post-retirement benefit plans.  See Note 1 for additional information.