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Significant Accounting Policies - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Equity method investments | $ 3,947 | $ 6,161 |
Other investments | 7,257 | 9,854 |
Defined contribution plan, expense | $ 8,203 | $ 11,909 | $ 11,136
Preference shares, authorized (in shares) | 145,000 | 145,000 | 95,000

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