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Goodwill and intangible assets - Summary of Intangible Assets (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Definite-lived intangible assets    
Accumulated Amortization $ (41,574,000) $ (31,378,000)
Indefinite-lived intangible assets    
Total intangible assets, Gross Carrying Amount 174,049,000 174,049,000
Total Intangible Assets, Currency Translation Adjustment 3,175,000 273,000
Total Intangible Assets, Net Carrying Amount 135,650,000 142,944,000
Easements    
Indefinite-lived intangible assets    
Gross Carrying Amount 1,191,000 1,191,000
Currency Translation Adjustment (34,000) (14,000)
Net Carrying Amount 1,157,000 1,177,000
Favorable vessel charter contracts    
Definite-lived intangible assets    
Gross Carrying Amount 106,500,000 106,500,000
Accumulated Amortization (36,630,000) (27,074,000)
Currency Translation Adjustment 0 0
Net Carrying Amount $ 69,870,000 $ 79,426,000
Weighted Average Life 3 years 3 years
Permits and development rights    
Definite-lived intangible assets    
Gross Carrying Amount $ 48,217,000 $ 48,217,000
Accumulated Amortization (3,516,000) (3,311,000)
Currency Translation Adjustment 159,000 (119,000)
Net Carrying Amount $ 44,860,000 $ 44,787,000
Weighted Average Life 38 years 38 years
Acquired power purchase agreements    
Definite-lived intangible assets    
Gross Carrying Amount $ 16,585,000 $ 16,585,000
Accumulated Amortization (1,173,000) (750,000)
Currency Translation Adjustment 3,050,000 406,000
Net Carrying Amount $ 18,462,000 $ 16,241,000
Weighted Average Life 17 years 17 years
Easements    
Definite-lived intangible assets    
Gross Carrying Amount $ 1,556,000 $ 1,556,000
Accumulated Amortization (255,000) (243,000)
Currency Translation Adjustment 0 0
Net Carrying Amount $ 1,301,000 $ 1,313,000
Weighted Average Life 30 years 30 years