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Financial Risk Management - Proportions of Variable-rate and Fixed-rate Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 822,152 $ 539,007
Fixed interest rate [member]    
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 768,002 $ 520,471 [1]
Percentage [1] 93.00% 97.00%
Floating interest rate [member]    
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 54,150 $ 18,536
Percentage 7.00% 3.00%
[1] Out of the $768 million fixed rate borrowings, $728 million are short-term.