Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Balance Sheet Location and Fair Value of Derivative Assets and Liabilities

The following table presents the Company’s derivative assets and liabilities, as well as the effects of offsetting, as of December 31, 2017, September 30, 2017 and December 31, 2016:

	December 31, 2017			September 30, 2017			December 31, 2016
Derivative assets:
Derivatives subject to PGC and DS mechanisms:
Commodity contracts	$	450		$	1,665		$	6,926
Derivatives not subject to PGC and DS mechanisms:
Commodity contracts	247			142			151
Total derivative assets — gross	697			1,807			7,077
Gross amounts offset in the balance sheet	(19		)	(450		)	—
Total derivative assets — net (a)	$	678		$	1,357		$	7,077
Derivative liabilities:
Derivatives subject to PGC and DS mechanisms:
Commodity contracts	$	(2,263	)	$	(1,520	)	$	(295	)
Total derivative liabilities — gross	(2,263		)	(1,520		)	(295		)
Gross amounts offset in the balance sheet	19			450			—
Total derivative liabilities — net (a)	$	(2,244	)	$	(1,070	)	$	(295	)

Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest

The following table provides information on the effects of derivative instruments not subject to ratemaking mechanisms on the condensed consolidated statements of income and changes in AOCI for the three months ended December 31, 2017 and 2016:

	Loss Reclassified from AOCI into Income						Location of Loss Reclassified from AOCI into Income
Three Months Ended December 31,	2017			2016
Cash Flow Hedges:
Interest rate contracts	$	(871	)	$	(846	)	Interest expense
	Gain Recognized in Income						Location of Gain Recognized in Income
Three Months Ended December 31,	2017			2016
Derivatives Not Subject to PGC and DS Mechanisms:
Gasoline contracts	$	149		$	130		Operating and administrative expenses