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Description of Business and Basis of Presentation (Details) a in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2015 segment | Sep. 30, 2018 USD ($) a classification | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) a classification segment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) segment
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments | segment | 2 |  |  |  |  |  |  |  |  | 2 |  | 2
Net loss attributable to subsidiary |  | $ (218,000) | $ (8,000) | $ (16,000) | $ (8,000) | $ (81,000) | $ (7,000) | $ 51,000 | $ (8,000) | $ (250,000) | $ (45,000) | $ (34,000)
Net income (loss) |  | $ 718,000 | $ 9,100,000 | $ (5,514,000) | $ 8,746,000 | $ (19,028,000) | $ 5,479,000 | $ 5,833,000 | $ (1,735,000) | 13,050,000 | (9,451,000) | 6,993,000
Citree |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to subsidiary |  |  |  |  |  |  |  |  |  | 511,854 | 91,432 | 69,230
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 261,046 | $ 46,630 | $ 35,307
Land |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of land owned (in acres) | a |  | 117 |  |  |  |  |  |  |  | 117 |  |
Number of primary classifications | classification |  | 2 |  |  |  |  |  |  |  | 2 |  |
Mineral Rights |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of land owned (in acres) | a |  | 90 |  |  |  |  |  |  |  | 90 |  |

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