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Information By Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 486,747	$ 506,859	$ 1,467,421	$ 1,517,473
Gross profit	165,318	170,749	500,403	503,657
Operating Income (Loss)	37,364	6,410	104,228	65,457
Total other income (expense)	(3,870)	(1,882)	(14,106)	(8,824)
Income Before Income Taxes	33,494	4,528	90,122	56,633
Electricity Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	240,142	242,667	729,225	692,785
Gross profit	76,440	75,362	222,227	210,840
Operating Income (Loss)	17,114	20,452	51,629	51,092
Gas Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	131,780	144,185	394,691	433,707
Gross profit	46,260	56,096	147,036	158,156
Operating Income (Loss)	20,030	7,136	57,849	48,811
Water Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenues	114,825	120,007	343,505	390,981
Gross profit	42,618	39,291	131,140	134,661
Operating Income (Loss)	14,837	(3,546)	40,258	28,707
Corporate Unallocated [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (14,617)	$ (17,632)	$ (45,508)	$ (63,153)

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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