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Changes in Accumulated Other Comprehensive Income by Component
 6 Months Ended
Jun. 30, 2018
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 other comprehensive income (OCI) by component during the applicable period:
 
Three Months Ended June 30, 2018
 
Natural gas cash
flow hedges, net of tax
 
Interest rate
cash flow
hedges, net
of tax
 
Other post-
retirement
benefit liability
adjustment,
net of tax
 
Accumulated
OCI, net of tax
 
(Thousands)
Accumulated OCI (loss), net of tax, as of April 1, 2018
$
4,338

 
$
(511
)
 
$
(6,442
)
 
$
(2,615
)
(Gains) losses reclassified from accumulated OCI, net of tax
(466
)
(a)
36

(a)
86

(b)
(344
)
Accumulated OCI (loss), net of tax, as of June 30, 2018
$
3,872

 
$
(475
)
 
$
(6,356
)
 
$
(2,959
)
 
Three Months Ended June 30, 2017
 
Natural gas cash
flow hedges, net of tax
 
Interest rate
cash flow
hedges, net
of tax
 
Other post-
retirement
benefit liability
adjustment,
net of tax
 
Accumulated
OCI, net of tax
 
(Thousands)
Accumulated OCI (loss), net of tax, as of April 1, 2017
$
8,719

 
$
(663
)
 
$
(6,790
)
 
$
1,266

(Gains) losses reclassified from accumulated OCI, net of tax
(1,672
)
(a)
36

(a)
77

(b)
(1,559
)
Accumulated OCI (loss), net of tax, as of June 30, 2017
$
7,047

 
$
(627
)
 
$
(6,713
)
 
$
(293
)

 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2018
 
Natural gas cash
flow hedges, net of tax
 
Interest rate
cash flow
hedges, net
of tax
 
Other post-
retirement
benefit liability
adjustment,
net of tax
 
Accumulated
OCI, net of tax
 
(Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2018
$
4,625

 
$
(555
)
 
$
(6,528
)
 
$
(2,458
)
(Gains) losses reclassified from accumulated OCI, net of tax
(753
)
(a)
80

(a)
172

(b)
(501
)
Accumulated OCI (loss), net of tax, as of June 30, 2018
$
3,872

 
$
(475
)
 
$
(6,356
)
 
$
(2,959
)
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 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, net of tax
 
(Thousands)
Accumulated OCI (loss), net of tax, as of January 1, 2017
$
9,607

 
$
(699
)
 
$
(6,866
)
 
$
2,042

(Gains) losses reclassified from accumulated OCI, net of tax
(2,560
)
(a)
72

(a)
153

(b)
(2,335
)
Accumulated OCI (loss), net of tax, as of June 30, 2017
$
7,047

 
$
(627
)
 
$
(6,713
)
 
$
(293
)
(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)   The accumulated OCI reclassification is attributable to the net actuarial loss and net prior service cost related to the Company’s post-retirement benefit plans. See Note 1 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for additional information.