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Significant Accounting Policies - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Other investments | $ 9,854 | $ 8,072 |
Defined contribution plan, expense | $ 11,909 | $ 11,136 | $ 10,031
Preference shares, authorized (in shares) | 145,000 | 95,000 |
Preference shares, issued (in shares) | 145,000 | 95,000 |

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