Segment Information Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following table presents information about our reportable segments.

	For the Year Ended December 31,
	2017			2016			2015
(in thousands)
Operating Revenues, Unaffiliated Customers
Regulated Energy	$	316,971		$	302,402		$	300,674
Unregulated Energy	300,612			196,458			158,570
Total operating revenues, unaffiliated customers	$	617,583		$	498,860		$	459,244
Intersegment Revenues(1)
Regulated Energy	$	9,339		$	3,287		$	1,228
Unregulated Energy	23,983			7,321			3,537
Other businesses	774			880			880
Total intersegment revenues	$	34,096		$	11,488		$	5,645
Operating Income
Regulated Energy	$	73,160		$	69,851		$	60,985
Unregulated Energy	12,477			13,844			16,355
Other businesses and eliminations	206			401			418
Operating Income	85,843			84,096			77,758
Other (expense) income	(765		)	(441		)	293
Interest charges	12,645			10,639			10,006
Income Before Income taxes	72,433			73,016			68,045
Income taxes	14,309			28,341			26,905
Net Income	$	58,124		$	44,675		$	41,140
Depreciation and Amortization
Regulated Energy	$	28,554		$	25,677		$	24,195
Unregulated Energy	7,954			6,386			5,679
Other businesses and eliminations	91			96			98
Total depreciation and amortization	$	36,599		$	32,159		$	29,972
Capital Expenditures
Regulated Energy	$	159,011		$	139,994		$	98,372
Unregulated Energy	26,190			23,984			90,895
Other businesses	5,902			5,398			5,994
Total capital expenditures	$	191,103		$	169,376		$	195,261

⁽¹⁾ All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.

	As of December 31,
	2017		2016
Identifiable Assets
Regulated Energy	$	1,121,673	$	986,752
Unregulated Energy	261,541		226,368
Other businesses	34,220		16,099
Total identifiable assets	$	1,417,434	$	1,229,219