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Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2016

Other Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets [Table Text Block]



		Useful						Accumulated
As of December 31, 2016		Life		Gross				Amortization				Net
Intangible assets subject to amortization:
Supply contract		11.5		$	12,227			$	(11,075	)		$	1,152
Intangible assets not subject to amortization:
Rights-of-way assets		Indefinite		13,268								13,268
Total				$	25,495			$	(11,075	)		$	14,420



		Useful						Accumulated
As of December 31, 2015		Life		Gross				Amortization				Net
Intangible assets subject to amortization:
Supply contract		11.5		$	12,227			$	(10,012	)		$	2,215
Intangible assets not subject to amortization:
Rights-of-way assets		Indefinite		13,267								13,267
Total				$	25,494			$	(10,012	)		$	15,482