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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2014
Fair Value Measurements [Abstract] |
Schedule of Fair Value, Assets and Liabilities 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 June 30, 2014 and December 31, 2013 was as follows (in thousands):
|  | As of June 30, 2014
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | 41 |  |  | $ | — |  |  | $ | 41 |
Commodity derivatives |  | — |  |  | 309 |  |  | — |  |  | 309 |
Total assets |  | — |  |  | 350 |  |  | — |  |  | 350 |
Liabilities |  |  |  |  |  |  |  |  |
Commodity derivatives |  | — |  |  | (21 | ) |  | — |  |  | (21 | )
Net assets |  | $ | — |  |  | $ | 329 |  |  | $ | — |  |  | $ | 329 |
|  | As of December 31, 2013
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | 116 |  |  | $ | — |  |  | $ | 116 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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