Fair Value Measurements Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Measurements [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The fair value hierarchy for our financial assets accounted for at fair value on a recurring basis at December 31, 2016 and 2015 was as follows: (in thousands):

	As of December 31, 2016
	Level 1		Level 2			Level 3		Total
Assets
OTC commodity swaps	$	—	$	9		$	—	$	9
Total assets	—		9			—		9
Liabilities
OTC commodity swaps	—		(82		)	—		(82		)
Net liabilities	$	—	$	(73	)	$	—	$	(73	)

	As of December 31, 2015
	Level 1		Level 2			Level 3		Total
Assets
OTC commodity swaps	$	—	$	171		$	—	$	171
Total assets	—		171			—		171
Liabilities
OTC commodity swaps	—		(45		)	—		(45		)
Net assets	$	—	$	126		$	—	$	126