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Significant Accounting Policies - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	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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