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Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets [Table Text Block]

		Useful						Accumulated
As of December 31, 2012		Life		Gross				Amortization				Net
Intangible assets subject to amortization:
Supply contracts		11.5 years		$	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

		Useful						Accumulated
As of December 31, 2011		Life		Gross				Amortization				Net
Intangible assets subject to amortization:
Supply contracts		11.5 years		$	12,227			$	(5,759	)		$	6,468
Intangible assets not subject to amortization:
Rights-of-way assets		Indefinite		3,557				—				3,557
Total				$	15,784			$	(5,759	)		$	10,025

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- Definition

Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance by major class.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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