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Changes in Accumulated Other Comprehensive Income (Loss) by Component (Tables)
 6 Months Ended
Jun. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of the changes in accumulated OCI by component
The following table explains the changes in accumulated OCI (loss) by component.
 
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 (loss), net of tax
 
(Thousands)
As of April 1, 2019
$
—

 
$
(345
)
 
$
(5,439
)
 
$
(5,784
)
Losses reclassified from accumulated OCI, net of tax
—

 
42

(a)
76

(b)
118

As of June 30, 2019
$
—

 
$
(303
)
 
$
(5,363
)
 
$
(5,666
)
 
 
 
 
 
 
 
 
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
)
As of June 30, 2018
$
3,872

 
$
(475
)
 
$
(6,356
)
 
$
(2,959
)
 
 
 
 
 
 
 
 
As of January 1, 2019
$
—

 
$
(387
)
 
$
(5,019
)
 
$
(5,406
)
Losses reclassified from accumulated OCI, net of tax
—


84

(a)
152

(b)
236

Change in accounting principle
—

 
—

 
(496
)
(c)
(496
)
As of June 30, 2019
$
—

 
$
(303
)
 
$
(5,363
)
 
$
(5,666
)
 
 
 
 
 
 
 
 
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
)
As of June 30, 2018
$
3,872

 
$
(475
)
 
$
(6,356
)
 
$
(2,959
)


(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 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 for additional information.
(c)
Related to adoption of ASU 2018-02. See Note 1 for additional information.