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Capital Risk Management (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Capital Risk Management    
Borrowings-current portion $ 90,358 $ 99,307
Borrowings-non-current portion 831,588 986,451
Lease liabilities-current portion 17,433 10,342
Lease liabilities-non-current portion 45,136 45,556
Derivative financial instruments-current liability   5,184
Derivative financial instruments-non-current liability   4,061
Derivative financial instruments-current asset (2,440)  
Derivative financial instruments-non-current asset (1,136)  
Total indebtedness 980,939 1,150,901
Total assets $ 2,015,434 $ 2,131,733
Total indebtedness/total assets 48.70% 54.00%