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Long-term debt - Schedule (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 2,363,372,000 $ 1,768,853,000
Less current maturities (39,771,000) (38,420,000)
Non-current portion of long-term debt 2,323,601,000 1,730,433,000
Debt discounts and deferred financing fees 25,400,000 20,400,000
Unsecured notes    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt 1,979,125,000 1,535,662,000
$250 million at 5.25% due March 1, 2022    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt 0 248,912,000
Notional amount $ 250,000,000  
$250 million at 5.25% due March 1, 2022 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.25%  
$300 million at 4.25% due December 1, 2024    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 297,999,000 297,607,000
Notional amount $ 300,000,000  
$300 million at 4.25% due December 1, 2024 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 4.25%  
$700 million at 5.125% due October 15, 2027    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 691,434,000 0
Notional amount $ 700,000,000  
Interest rate 5.125%  
$700 million at 5.125% due October 15, 2027 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.125%  
$700 million at 5.25% due December 15, 2029    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 694,282,000 693,822,000
Notional amount $ 700,000,000  
$700 million at 5.25% due December 15, 2029 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.25%  
$300 million at 5.65% due December 1, 2044    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 295,410,000 295,321,000
Notional amount $ 300,000,000  
$300 million at 5.65% due December 1, 2044 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.65%  
Geismar 3 construction facility    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 176,335,000 0
Geismar 3 construction facility | LIBOR    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 3.00%  
Egypt limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 46,948,000 75,165,000
Egypt limited recourse debt facilities | LIBOR | Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 1.60%  
Egypt limited recourse debt facilities | LIBOR | Top of range    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 1.90%  
Other limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 160,964,000 158,026,000
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 0 1,526,000
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 | LIBOR | Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 0.75%  
LIBOR Plus 0.75% to LIBOR Plus 2.5% due 2019 to 2021 | LIBOR | Top of range    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 2.50%  
5.58% due June 30, 2031    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 69,734,000 73,700,000
5.58% due June 30, 2031 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.58%  
5.35% due September 30, 2033    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 78,391,000 82,800,000
5.35% due September 30, 2033 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.35%  
5.08% due September 15, 2036    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 12,839,000 $ 0
5.08% due September 15, 2036 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.08%