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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.

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