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Basis of presentation - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 15, 2020
Sep. 30, 2020
Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Disposal gain on sale of business/asset   $ 159,753 $ 26,842
Business acquisition, transaction costs $ 1,000    
AWR Corporation | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Proceeds from sale of business 161,000    
Disposal gain on sale of business/asset $ 160,000