Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.8.0.1
Basis of Presentation (Details)
a in Thousands
3 Months Ended
Dec. 31, 2017
USD ($)
a
classification
segment
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]    
Number of business segments | segment 3  
Ownership interest (as a percent) 51.00% 51.00%
Citree    
Property, Plant and Equipment [Line Items]    
Net loss attributable to noncontrolling interest | $ $ 16,219 $ 15,848
Land    
Property, Plant and Equipment [Line Items]    
Area of land owned (in acres) 122  
Number of primary classifications | classification 2  
Mineral Rights    
Property, Plant and Equipment [Line Items]    
Area of land owned (in acres) 90