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Other long-term liabilities - Preferred Shares, Series C (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2019
$ / shares
Class of Stock [Line Items]      
Debt conversion, shares issued (in shares) | shares 19,429 56,926  
Preferred stock redemption price per share (in USD per share) | $ / shares     $ 25
2020 $ 602,028    
2021 117,513    
2022 351,227    
2023 97,478    
2024 215,743    
Thereafter to 2031 2,547,916    
Total Preferred shares series C $ 13,793 $ 13,418  
Series C Preferred Stock      
Class of Stock [Line Items]      
Redeemable preferred stock issued, shares | shares 100    
Preferred stock redemption price per share (in USD per share) | $ / shares     $ 53,400
Less amounts representing interest $ (5,609)    
Total Preferred shares series C 13,793    
Less current portion (1,035)    
Preferred shares series C, noncurrent 12,758    
Series C Preferred Stock | Dividends Payable      
Class of Stock [Line Items]      
2020 1,035    
2021 1,050    
2022 1,070    
2023 1,243    
2024 1,454    
Thereafter to 2031 9,439    
Redemption amount 4,111    
Estimated dividend and redemption payments $ 19,402    
Executives of company | Series C Preferred Stock      
Class of Stock [Line Items]      
Redeemable preferred stock issued, shares | shares 36    
Convertible Unsecured Subordinated Debentures | Convertible Subordinated Debt      
Class of Stock [Line Items]      
Principle converted amount $ 148 $ 447  
Atlantica      
Class of Stock [Line Items]      
Contingent consideration related to prior acquisition 29,100    
San Antonio Water System      
Class of Stock [Line Items]      
Additional deferred credits related to investment in San Antonio Water System $ 5,000