AMORTIZING INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible assets and liabilities subject to amortization

Details regarding our intangible assets, all of which are subject to amortization, follow:

	September 30, 2019
	Gross carrying amount		Accumulated amortization			Net
	(In thousands)
Favorable gas gathering contracts	$	24,195	$	(14,891	)	$	9,304
Contract intangibles		278,448		(163,152	)		115,296
Rights-of-way		160,460		(41,287	)		119,173
Total intangible assets	$	463,103	$	(219,330	)	$	243,773

	December 31, 2018
	Gross carrying amount		Accumulated amortization			Net
	(In thousands)
Favorable gas gathering contracts	$	24,195	$	(13,905	)	$	10,290
Contract intangibles		278,448		(143,962	)		134,486
Rights-of-way		166,209		(37,569	)		128,640
Total intangible assets	$	468,852	$	(195,436	)	$	273,416

Recognized amortization expense in other revenues and cost and expenses

We recognized amortization expense in Other revenues as follows:

	Three months ended September 30,						Nine months ended September 30,
	2019			2018			2019			2018
	(In thousands)
Amortization expense – favorable gas gathering contracts	$	(234	)	$	(389	)	$	(986	)	$	(1,166	)

We recognized amortization expense in costs and expenses as follows:

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
	(In thousands)
Amortization expense – contract intangibles	$	6,396	$	6,535	$	19,190	$	19,605
Amortization expense – rights-of-way		1,573		1,641		4,694		4,818

Estimated aggregate annual amortization expected to be recognized

The estimated aggregate annual amortization expected to be recognized for the remainder of 2019 and each of the four succeeding fiscal years follows.

	Intangible assets
	(In thousands)
2019	$	8,003
2020		32,073
2021		28,381
2022		25,314
2023		25,260