Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Text Block [Abstract]

Schedule of Derivative Instruments [Table Text Block]

As of December 31, 2018, the volume of our open commodity derivative contracts were as follows:

Business unit	Commodity	Quantity hedged (in millions)	Designation	Longest Expiration date of hedge
PESCO/natural gas marketing	Natural gas (Dts)	14.4	Cash flows hedges	March 2022
PESCO/natural gas marketing	Natural gas (Dts)	3.8	Not designated	December 2020
Sharp/propane operations	Propane (gallons)	9.7	Cash flows hedges	June 2021
Sharp/propane operations	Propane (gallons)	0.3	Fair value hedges	March 2019

Offsetting Assets and Liabilities [Table Text Block]

The following table summarizes the accounts receivable and payables on a gross and net basis at December 31, 2018 and 2017:

	At December 31, 2018
(in thousands)	Gross amounts		Amounts offset		Net amounts
Accounts receivable	$	12,368	$	3,834	$	8,534
Accounts payable	$	24,741	$	3,834	$	20,907

	At December 31, 2017
(in thousands)	Gross amounts		Amounts offset		Net amounts
Accounts receivable	$	8,283	$	2,391	$	5,892
Accounts payable	$	16,643	$	2,391	$	14,252

Schedule of Due to (from) Broker-Dealers and Clearing Organizations [Table Text Block]

The balances related to PESCO are as follows:

(in thousands)	Balance Sheet Location	December 31, 2018		December 31, 2017
PESCO	Other Current Assets	$	2,810	$	6,300

Fair Values of Derivative Contracts Recorded in Consolidated Balance Sheets

Fair values of the derivative contracts recorded in the consolidated balance sheets as of December 31, 2018 and 2017 are as follows:

	Derivative Assets
		Fair Value As Of
(in thousands)	Balance Sheet Location	December 31, 2018		December 31, 2017
Derivatives not designated as hedging instruments
Propane swap agreements	Derivative assets, at fair value	$	—	$	13
Natural gas futures contracts	Derivative assets, at fair value	4,024		—
Derivatives designated as fair value hedges
Propane put options	Derivative assets, at fair value	71		—
Derivatives designated as cash flow hedges
Natural gas futures contracts	Derivative assets, at fair value	9,059		92
Propane swap agreements	Derivative assets, at fair value	11		1,181
Total Derivative Assets		$	13,165	$	1,286

	Derivative Liabilities
		Fair Value As Of
(in thousands)	Balance Sheet Location	December 31, 2018		December 31, 2017
Derivatives not designated as hedging instruments
Natural gas futures contracts	Derivative liabilities, at fair value	$	4,562	$	5,776
Derivatives designated as cash flow hedges
Natural gas futures contracts	Derivative liabilities, at fair value	8,705		—
Natural gas swap contracts	Derivative liabilities, at fair value	—		469
Propane swap agreements	Derivative liabilities, at fair value	1,604		2
Total Derivative Liabilities		$	14,871	$	6,247

Derivative Instruments and Hedging Activities Disclosure [Text Block]

The effects of gains and losses from derivative instruments are as follows:

	Amount of Gain (Loss) on Derivatives:
	Location of Gain (Loss) on Derivatives	For the Year Ended December 31,
(in thousands)		2018			2017			2016
Derivatives not designated as hedging instruments
Realized gain (loss) on forward contracts and options (1)	Revenue	$	—		$	112		$	(546	)
Natural gas futures contracts	Cost of sales	(3,189		)	(3,633		)	(541		)
Propane swap agreements	Cost of sales	(13		)	8			7
Natural gas swap contracts	Cost of sales	—			1			—
Derivatives designated as fair value hedges
Put/Call option	Cost of sales	—			(9		)	49
Natural gas futures contracts	Natural gas inventory	—			—			(233		)
Derivatives designated as cash flow hedges
Propane swap agreements	Cost of sales	(647		)	1,607			(364		)
Propane swap agreements	Other comprehensive income (loss)	(2,773		)	487			1,016
Natural gas futures contracts	Cost of sales	(2,010		)	(456		)	345
Natural gas swap contracts	Cost of sales	197			(822		)	—
Natural gas futures contracts	Other comprehensive income (loss)	532			(1,476		)	222
Natural gas swap contracts	Other comprehensive income	200			986			—
Total		$	(7,703	)	$	(3,195	)	$	(45	)

⁽¹⁾ All of the realized and unrealized gain (loss) on forward contracts represents the effect of trading activities on our consolidated statements of income.

Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

As of December 31, 2018, the following amounts were recorded in the consolidated balance sheets related to fair value hedges:

(in thousands)	Carrying Amount of Hedged Item				Cumulative Adjustment Included in Carrying Amount of Hedged Item
Balance Sheet Location of Hedged Items	At December 31, 2018		At December 31, 2017		At December 31, 2018		At December 31, 2017
Inventory	$	212	$	—	$	—	$	—