Intangibles

12 Months Ended

Dec. 31, 2015

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets Disclosure [Text Block]

11. Intangible Assets, Net

A summary of intangible assets, net is presented in the table below:

	December 31, 2015							December 31, 2014							Weighted Average Amortization Period (Years)
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
	(In thousands)
Customer relationships	$	7,551	$	(3,921	)	$	3,630	$	7,551	$	(3,366	)	$	4,185	6.5
Pipeline rights-of-way	6,414		(2,287		)	4,127		8,403		(4,015		)	4,388		6.4
	$	13,965	$	(6,208	)	$	7,757	$	15,954	$	(7,381	)	$	8,573

Intangible asset amortization expense was $1.2 million, $1.3 million and $0.7 million for the years ended December 31, 2015, 2014 and 2013, respectively, based upon estimates of useful lives ranging from 1 to 35 years.

Estimated amortization expense for the next five fiscal years is as follows (in thousands):

2016	$	1,110
2017	1,110
2018	1,110
2019	1,110
2020	1,110