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Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in accumulated other comprehensive income (loss)
Beginning Balance			$ 8,028,042	$ 6,373,063
Ending Balance	$ 9,257,453	$ 7,645,241	9,257,453	7,645,241
Cash flow hedges, net of tax | Natural gas cash flow hedges, net of tax
Changes in accumulated other comprehensive income (loss)
Beginning Balance	52,338	176,370	64,762	217,121
(Gains) losses reclassified from accumulated OCI, net of tax	(15,940)	(42,581)	(28,364)	(83,332)
Ending Balance	36,398	133,789	36,398	133,789
Cash flow hedges, net of tax | Interest rate cash flow hedges, net of tax
Changes in accumulated other comprehensive income (loss)
Beginning Balance	(807)	(951)	(843)	(987)
(Gains) losses reclassified from accumulated OCI, net of tax	36	36	72	72
Ending Balance	(771)	(915)	(771)	(915)
Pension and other post- retirement benefits liability adjustment, net of tax
Changes in accumulated other comprehensive income (loss)
Beginning Balance	(17,328)	(16,438)	(17,541)	(16,640)
(Gains) losses reclassified from accumulated OCI, net of tax	9,622	202	9,835	404
Ending Balance	(7,706)	(16,236)	(7,706)	(16,236)
Accumulated OCI, net of tax
Changes in accumulated other comprehensive income (loss)
Beginning Balance	34,203	158,981	46,378	199,494
(Gains) losses reclassified from accumulated OCI, net of tax	(6,282)	(42,343)	(18,457)	(82,856)
Ending Balance	$ 27,921	$ 116,638	$ 27,921	$ 116,638

X

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4I
-URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4590271-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4568740-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4568447-111683

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