Nature of Operations and Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Schedule of Goodwill

(In thousands of dollars)	Natural Gas Operations		Construction Services			Consolidated
December 31, 2014	$	10,095	$	133,065		$	143,160
Acquisition date adjustment		—		1,380			1,380
Foreign currency translation adjustment		—		(8,851	)		(8,851	)
March 31, 2015	$	10,095	$	125,594		$	135,689

Intercompany Transactions

Accounts receivable for these services are presented in the table below (thousands of dollars):

	March 31, 2015		December 31, 2014
Accounts receivable for Centuri services	$	8,854	$	9,169

Schedule of Other Property and Investments

Other Property and Investments. Other property and investments includes (millions of dollars):

	March 31, 2015			December 31, 2014
Centuri property and equipment	$	402		$	405
Centuri accumulated provision for depreciation and amortization		(195	)		(187	)
Net cash surrender value of COLI policies		101			99
Other property		12			10
Total	$	320		$	327

Other Income (Deductions)

The following table provides the composition of significant items included in Other income (deductions) in the condensed consolidated statements of income (thousands of dollars):

	Three Months Ended					Twelve Months Ended
	March 31					March 31
	2015			2014		2015			2014
Change in COLI policies	$	1,300		$	900	$	5,700		$	9,500
Interest income		590			497		2,695			838
Pipe replacement costs		—			—		—			(47	)
Foreign transaction gain (loss)		(327	)		—		(505	)		—
Miscellaneous income and (expense)		709			215		(123	)		(448	)
Total other income (deductions)	$	2,272		$	1,612	$	7,767		$	9,843