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Long-term debt - Schedule (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 1,768,853 $ 1,458,286
Less current maturities (38,420) (383,793)
Non-current portion of long-term debt 1,730,433 1,074,493
Debt discounts and deferred financing fees 20,400 17,600
Unsecured notes    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt 1,535,662 1,189,976
3.25% due December 15, 2019    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 0 349,026
3.25% due December 15, 2019 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 3.25%  
5.25% due March 1, 2022    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 248,912 248,480
5.25% due March 1, 2022 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.25%  
4.25% due December 1, 2024    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 297,607 297,232
4.25% due December 1, 2024 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 4.25%  
5.25% due December 15, 2029    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.25%  
Total long-term debt $ 693,822 0
5.25% due December 15, 2029 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.25%  
5.65% due December 1, 2044    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 295,321 295,238
5.65% due December 1, 2044 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.65%  
Egypt limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 75,165 101,226
Egypt limited recourse debt facilities | LIBOR | Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 0.90%  
Egypt limited recourse debt facilities | LIBOR | Top of range    
Disclosure of detailed information about borrowings [line items]    
Basis spread, percent 1.60%  
Other limited recourse debt facilities    
Disclosure of detailed information about borrowings [line items]    
Total long-term debt $ 158,026 167,084
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 $ 1,526 5,483
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 $ 73,700 77,709
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 $ 82,800 $ 83,892
5.35% due September 30, 2033 | Fixed interest rate    
Disclosure of detailed information about borrowings [line items]    
Interest rate 5.35%