Other Intangibles (Notes)

12 Months Ended

Dec. 31, 2013

Other Intangible Assets Disclosure [Abstract]

Intangible Assets Disclosure [Text Block]

Other Intangible Assets

Our identifiable intangible assets are are as follows (in thousands):



	Useful			Accumulated
As of December 31, 2013	Life	Gross		Amortization			Net
Intangible assets subject to amortization:
Supply contracts	11.5	$	12,227	$	(7,885	)	$	4,342
Intangible assets not subject to amortization:
Rights-of-way assets	Indefinite	7,916		—			7,916
Total		$	20,143	$	(7,885	)	$	12,258



	Useful			Accumulated
As of December 31, 2012	Life	Gross		Amortization			Net
Intangible assets subject to amortization:
Supply contracts	11.5	$	12,227	$	(6,822	)	$	5,405
Intangible assets not subject to amortization:
Rights-of-way assets	Indefinite	7,025		—			7,025
Total		$	19,252	$	(6,822	)	$	12,430

Amortization of intangible assets was $1.1 million, during each of the years ended December 31, 2013, 2012 and 2011 and is included in depreciation and amortization on the accompanying consolidated statements of operations. Amortization expense is estimated to be $1.1 million per year for the years ended 2014 through 2017.