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Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total consideration		$ 1,953
UNITED KINGDOM
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 600	$ 1,600
UNITED STATES
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1,900
Shares repurchased	319,257
Total consideration	$ 3,100

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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