Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

v3.20.4
Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
financialInstitution
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Concentration Risk [Line Items]      
Depreciation expense $ 13,800,000 $ 8,500,000 $ 2,600,000
Valuation allowance   0  
Impairments 0 0 0
Depletion expense 400,000 300,000 0
Unrecognized tax benefits 0 0  
Land sales expenses $ 3,973,000 225,000 $ 19,000
Revision of prior period, reclassification, adjustment      
Concentration Risk [Line Items]      
Land sales expenses   200,000  
Service life      
Concentration Risk [Line Items]      
Depreciation expense   $ 2,400,000  
Cash and cash equivalents | Customer concentration risk      
Concentration Risk [Line Items]      
Number of customers | financialInstitution 3    
Sales revenue, net | Customer concentration risk      
Concentration Risk [Line Items]      
Concentration risk (in percentage) 28.30% 36.50% 31.30%
Maximum      
Concentration Risk [Line Items]      
Royalty payment arrangement, term 2 months    
Lease terms of payment arrangements 10 years    
Valuation allowance $ 100,000    
Maximum | Revision of prior period, reclassification, adjustment      
Concentration Risk [Line Items]      
Land sales expenses     $ 100,000
Maximum | Water service-related assets      
Concentration Risk [Line Items]      
Finite-lived intangible asset, useful life 30 years    
Minimum      
Concentration Risk [Line Items]      
Royalty payment arrangement, term 1 month    
Minimum | Water service-related assets      
Concentration Risk [Line Items]      
Finite-lived intangible asset, useful life 3 years