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Commitments and Other Contingencies - Non-core Assets Restructuring Costs (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   $ 2,904
One-time Termination Benefits | Real Estate Segment    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   1,422
One-time Termination Benefits | Other Natural Resources    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges   164
General and Administrative Expense | One-time Termination Benefits    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 3,314 $ 486