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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 and 2014 was as follows: (in thousands):
|  | As of December 31, 2015
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
OTC commodity swaps |  | $ | — |  |  | $ | 171 |  |  | $ | — |  |  | $ | 171 |
Total assets |  | — |  |  | 171 |  |  | — |  |  | 171 |
Liabilities |  |  |  |  |  |  |  |
OTC commodity swaps |  | — |  |  | (45 | ) |  | — |  |  | (45 | )
Net Assets |  | $ | — |  |  | $ | 126 |  |  | $ | — |  |  | $ | 126 |
|  | As of December 31, 2014
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | 24 |  |  | $ | — |  |  | $ | 24 |
OTC commodity swaps |  | — |  |  | 456 |  |  | — |  |  | 456 |
Total assets |  | — |  |  | 480 |  |  | — |  |  | 480 |
Liabilities |  |  |  |  |  |  |  |
OTC commodity swaps |  | — |  |  | (61 | ) |  | — |  |  | (61 | )
Net assets |  | $ | — |  |  | $ | 419 |  |  | $ | — |  |  | $ | 419 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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