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Energy Purchase Contracts (Tables)

12 Months Ended

Dec. 31, 2017

Energy Purchase Contracts [Line Items]

Schedule of Utility Total Expenses

	2017				2016				2015
Utility power resources	$	380,523			$	402,575			$	511,937

Future Contractual Commitments for Power Resources and Natural Gas Resources

	2018				2019				2020				2021				2022				Thereafter				Total
Power resources	$	189,262			$	185,610			$	161,596			$	149,125			$	147,573			$	916,255			$	1,749,421
Natural gas resources	77,936				60,942				48,098				31,428				31,428				326,482				576,314
Total	$	267,198			$	246,552			$	209,694			$	180,553			$	179,001			$	1,242,737			$	2,325,735

Contractual Obligations [Member]

Energy Purchase Contracts [Line Items]

Future Contractual Commitments for Power Resources and Natural Gas Resources

	2018				2019				2020				2021				2022				Thereafter				Total
Contractual obligations	$	32,205			$	34,996			$	33,961			$	28,939			$	33,925			$	193,595			$	357,621

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Energy Purchase Contracts [Line Items]

+ References

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Schedule of the total amount of power purchased, natural gas purchased, fuel for generation and other fuel costs, which are included in utility resource costs in the Consolidated Statements of Income.

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Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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