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Business Segments - Revenue Components of Mineral Resources Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 well | Mar. 31, 2013
Revenue from External Customer [Line Items] |  |
Segment revenues | $ 7,145 | $ 9,760
Decrease in Oil Royalty Revenues | 514 |
Price Per Barrel of Oil Equivalents (BOE) | 97 | 101
New Production Wells | 3 |
Mineral resources |  |
Revenue from External Customer [Line Items] |  |
Decrease in Revenues | 602 |
Decrease in Revenues, Percent | 21.00% |
Segment revenues | 2,264 | 2,866
Decrease in Production, Percent | 21.00% |
Decrease in Price Per Barrel, Percent | 4.00% |
Mineral resources | Oil and gas |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 1,740 | 2,254
Mineral resources | Rock aggregate |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 263 | 140
Mineral resources | Cement |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 205 | 160
Mineral resources | Land lease for oil exploration |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | $ 56 | $ 312

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- Definition Production costs incurred in lifting the oil and gas to the surface during the reporting period divided by the number of barrels of oil equivalents (BOE) produced. Production (or lifting costs) are costs incurred in lifting the oil and gas to the surface and generally include gathering, treating, primary processing, field storage, property taxes and insurance on proved properties, but do not include depreciation, depletion, accretion, amortization, royalties, income taxes, interest, general and administrative and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 3 -Subparagraph A + Details
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- Definition The number of productive developmental wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 6 -Subparagraph A + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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