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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2013 Diamondback [Member] | Dec. 31, 2012 Diamondback [Member] | Dec. 31, 2013 Federal [Member] | Dec. 31, 2013 Louisiana [Member]
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |
Net operating loss carryforward |  |  |  |  |  | $ 4,200,000 | $ 84,800,000
Alternative minimum tax credits | 7,968,000 | 1,000,000 | 1,643,000 |  |  |  |
Foreign tax credit carryforwards | 2,074,000 | 0 | 2,074,000 |  |  |  |
Valuation allowance of deferred tax assets | 4,743,000 | 12,347,000 | 4,629,000 |  |  |  |
Taxable gain on contribution |  |  |  |  | 61,900,000 |  |
Change in deferred tax asset valuation | 0 | (42,087,000) |  |  | (9,792,000) |  |
Deferred tax expense |  |  |  | 35,700,000 | 25,600,000 |  |
Gain from sale of equity investment |  |  |  | 120,000,000 |  |  |
Current tax expense |  |  |  | $ 13,200,000 |  |  |

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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