Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies- Summary Of Changes in Accounting Estimates (Details)

v3.19.3
Summary of Significant Accounting Policies- Summary Of Changes in Accounting Estimates (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]        
Depreciation and amortization $ 2,631 $ 706 $ 5,286 $ 1,519
Net income $ 60,022 $ 50,762 $ 249,606 $ 147,056
Net income per Sub-share Certificate — basic and diluted $ 7.74 $ 6.52 $ 32.18 $ 18.86
Minimum | Water service-related assets        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life 4 years      
Maximum | Water service-related assets        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life 15 years      
Service Life        
Finite-Lived Intangible Assets [Line Items]        
Depreciation and amortization $ 916   $ 916  
Net income $ (723)   $ (723)  
Net income per Sub-share Certificate — basic and diluted $ (0.09)   $ (0.09)