IDENTIFIABLE INTANGIBLE ASSETS, NONCURRENT LIABILITY AND GOODWILL (Tables)

6 Months Ended

Jun. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of identifiable intangible assets and a noncurrent liability, which are subject to amortization

Identifiable intangible assets and the noncurrent liability, which are subject to amortization, were as follows:

	June 30, 2014
	Useful lives (In years)	Gross carrying amount		Accumulated amortization			Net
	(Dollars in thousands)
Favorable gas gathering contracts	18.7	$	24,195	$	(7,185	)	$	17,010
Contract intangibles	12.5	426,464		(59,318		)	367,146
Rights-of-way	24.2	111,975		(10,052		)	101,923
Total amortizable intangible assets		$	562,634	$	(76,555	)	$	486,079
Unfavorable gas gathering contract	10.0	$	10,962	$	(5,007	)	$	5,955

	December 31, 2013
	Useful lives (In years)	Gross carrying amount		Accumulated amortization			Net
	(Dollars in thousands)
Favorable gas gathering contracts	18.7	$	24,195	$	(6,315	)	$	17,880
Contract intangibles	12.5	426,464		(43,158		)	383,306
Rights-of-way	24.3	108,706		(7,715		)	100,991
Total amortizable intangible assets		$	559,365	$	(57,188	)	$	502,177
Unfavorable gas gathering contract	10.0	$	10,962	$	(4,588	)	$	6,374

Schedule of recognized amortization expense within the statements of operations

We recognized amortization expense in revenues as follows:

	Three months ended June 30,						Six months ended June 30,
	2014			2013			2014			2013
	(In thousands)
Amortization expense – favorable gas gathering contracts	$	(436	)	$	(527	)	$	(870	)	$	(1,099	)
Amortization expense – unfavorable gas gathering contract	211			277			419			569
Amortization of favorable and unfavorable contracts	$	(225	)	$	(250	)	$	(451	)	$	(530	)

We recognized amortization expense in costs and expenses as follows:

	Three months ended June 30,				Six months ended June 30,
	2014		2013		2014		2013
	(In thousands)
Amortization expense – contract intangibles	$	8,198	$	7,421	$	16,160	$	12,709
Amortization expense – rights-of-way	1,178		872		2,337		1,680

Schedule of estimated aggregate amortization of intangible assets and the noncurrent liability for each of the five succeeding fiscal years

The estimated aggregate annual amortization of intangible assets and noncurrent liability expected to be recognized for the remainder of 2014 and each of the four succeeding fiscal years follows.

	Assets		Liability
	(In thousands)
2014	$	20,589	$	806
2015	43,872		1,650
2016	44,114		1,571
2017	42,846		1,438
2018	43,115		490