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Business Segments - Revenue Components of Mineral Resources Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Revenue from External Customer [Line Items] |  |
Segment revenues | $ 12,953 | $ 16,633
Income (loss) | 352 | 1,313
Mineral resources |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 8,740 | 10,200
Operating Segments | Mineral resources |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 8,740 | 10,200
Income (loss) | 4,047 | 4,426
Operating Segments | Mineral resources | Oil and gas |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 386 | 776
Operating Segments | Mineral resources | Water sales |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 7,791 | 8,993
Operating Segments | Mineral resources | Rock aggregate |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 202 | 102
Operating Segments | Mineral resources | Cement |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | 260 | 242
Operating Segments | Mineral resources | Land lease for oil exploration |  |
Revenue from External Customer [Line Items] |  |
Segment revenues | $ 101 | $ 87

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