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Inventory (Tables) | 6 Months Ended
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Jun. 30, 2013
Inventory Disclosure [Abstract] |
Schedule of Inventory | Inventory consists of the following:
| June 30, 2013 |  | December 31, 2012
| (In thousands)
Equipment and materials | $ | 10,562 |  |  | $ | 16,438 |
Crude oil inventory | 5,823 |  |  | 4,269 |
Total inventory | $ | 16,385 |  |  | $ | 20,707 |

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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