Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

The following table presents the absolute notional amounts related to open positions on NW Natural derivative instruments:

	March 31,				December 31,
In thousands	2019		2018		2018
Natural gas (in therms):
Financial	255,550		326,080		408,850
Physical	422,825		420,200		472,275
Foreign exchange	$	7,241	$	7,611	$	6,936

Income Statement Presentation of Derivative Instruments

The following table reflects the income statement presentation for the unrealized gains and losses from NW Natural's derivative instruments, which also represents all derivative instruments at NW Holdings:

	Three Months Ended March 31,
	2019						2018
In thousands	Natural gas commodity			Foreign exchange			Natural gas commodity			Foreign exchange
Benefit (expense) to cost of gas	$	7,007		$	(89	)	$	(5,747	)	$	(154	)
Operating revenues (expense)	2,367			—			(227		)	—
Amounts deferred to regulatory accounts on balance sheet	(9,029		)	89			5,895			154
Total gain (loss) in pre-tax earnings	$	345		$	—		$	(79	)	$	—

Table of Estimated Collateral Calls Table

Based upon current commodity financial swap and option contracts outstanding, which reflect unrealized losses of $0.5 million at March 31, 2019, we have estimated the level of collateral demands, with and without potential adequate assurance calls, using current gas prices and various credit downgrade rating scenarios for NW Natural as follows:

			Credit Rating Downgrade Scenarios
In thousands	(Current Ratings) A+/A3		BBB+/Baa1		BBB/Baa2		BBB-/Baa3		Speculative
With Adequate Assurance Calls	$	—	$	—	$	—	$	—	$	604
Without Adequate Assurance Calls	—		—		—		—		185