Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Regulatory Assets

Amounts deferred as regulatory assets and liabilities were as follows:

	Regulatory Assets
	June 30,				December 31,
In thousands	2019		2018		2018
Current:
Unrealized loss on derivatives(1)	$	4,385	$	11,744	$	12,381
Gas costs	19,195		273		2,873
Environmental costs(2)	5,089		5,594		5,601
Decoupling(3)	1,680		10,232		9,140
Pension balancing(4)	5,009		—		—
Income taxes	2,209		2,217		2,218
Other(5)	9,121		11,032		9,717
Total current	$	46,688	$	41,092	$	41,930
Non-current:
Unrealized loss on derivatives(1)	$	2,062	$	3,913	$	3,025
Pension balancing(4)	50,080		67,527		74,173
Income taxes	17,758		19,267		19,185
Pension and other postretirement benefit liabilities	168,137		171,186		174,993
Environmental costs(2)	68,240		65,156		76,149
Gas costs	2,994		28		9,978
Decoupling(3)	37		1,636		2,545
Other(5)	9,032		10,464		11,738
Total non-current	$	318,340	$	339,177	$	371,786

Schedule of Regulatory Liabilities

	Regulatory Liabilities
	June 30,				December 31,
In thousands	2019		2018		2018
Current:
Gas costs	$	5,630	$	20,906	$	17,182
Unrealized gain on derivatives(1)	1,944		1,938		8,740
Decoupling(3)	857		2,153		2,264
Income taxes	7,763		—		—
Other(5)	16,290		9,278		19,250
Total current	$	32,484	$	34,275	$	47,436
Non-current:
Gas costs	$	226	$	3,460	$	552
Unrealized gain on derivatives(1)	670		1,077		725
Decoupling(3)	74		410		—
Income taxes(6)	202,422		222,734		225,408
Accrued asset removal costs(7)	390,345		370,245		380,464
Other(5)	11,299		4,368		4,411
Total non-current	$	605,036	$	602,294	$	611,560

⁽¹⁾  Unrealized gains or losses on derivatives are non-cash items and therefore do not earn a rate of return or a carrying charge. These amounts are recoverable through NGD rates as part of the annual Purchased Gas Adjustment (PGA) mechanism when realized at settlement.

⁽²⁾  Refer to footnote (3) of the Deferred Regulatory Asset table in Note 17 for a description of environmental costs.

⁽³⁾  This deferral represents the margin adjustment resulting from differences between actual and expected volumes. 

⁽⁴⁾  Refer to Note 10 for information regarding the deferral of pension expenses.

⁽⁵⁾  Balances consist of deferrals and amortizations under approved regulatory mechanisms and typically earn a rate of return or carrying charge.

⁽⁶⁾  This balance represents estimated amounts associated with the Tax Cuts and Jobs Act. See Note 11.

⁽⁷⁾ 

Estimated costs of removal on certain regulated properties are collected through rates.