Annual report pursuant to Section 13 and 15(d)

Description of Business and Basis of Presentation (Details)

v3.10.0.1
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