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Changes in Accumulated Other Comprehensive Income by Component (Tables)
 12 Months Ended
Dec. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of the changes in accumulated OCI by component
The following tables explain the changes in accumulated OCI by component for the years ended December 31, 2015, 2014, and 2013:
 
 
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 January 1, 2015
 
$
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


 
 
Year Ended December 31, 2014
 
 
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 January 1, 2014
 
$
61,699

 
 
 
$
(1,132
)
 
 
 
$
(15,864
)
 
 
 
$
44,703

Gains recognized in accumulated OCI, net of tax
 
156,207

 
(a)
 
—

 
 
 
—

 
 
 
156,207

Gain reclassified from accumulated OCI, net of tax, into gain on sale/exchange of assets
 
(16,735
)
 
(a)
 
—

 
 
 
—

 
 
 
(16,735
)
Losses (gains) reclassified from accumulated OCI, net of tax
 
15,950

 
(a)
 
145

 
(a)
 
(776
)
 
(b)
 
15,319

Change in accumulated OCI, net of tax
 
155,422

 
 
 
145

 
 
 
(776
)
 
 
 
154,791

Accumulated OCI (loss), net of tax, as of December 31, 2014
 
$
217,121

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


 
 
Year Ended December 31, 2013
 
 
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 January 1, 2013
 
$
138,188

 
 
 
$
(1,276
)
 
 
 
$
(37,365
)
 
 
 
$
99,547

Gains recognized in accumulated OCI, net of tax
 
10,669

 
(a)
 
—

 
 
 
2,081

 
 
 
12,750

(Gains) losses reclassified from accumulated OCI, net of tax
 
(87,158
)
 
(a)
 
144

 
(a)
 
19,420

 
(b)
 
(67,594
)
Change in accumulated OCI, net of tax
 
(76,489
)
 
 
 
144

 
 
 
21,501

 
 
 
(54,844
)
Accumulated OCI (loss), net of tax, as of December 31, 2013
 
$
61,699

 
 
 
$
(1,132
)
 
 
 
$
(15,864
)
 
 
 
$
44,703


(a)        See Note 6 for additional information.

(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 14 for additional information.