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Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Mar. 31, 2021 USD ($) shares	Mar. 31, 2021 £ / shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2020 £ / shares
Statement of Financial Position [Abstract]
Allowance for doubtful accounts | $	$ 11,268		$ 10,310
Ordinary shares, par value (in pounds per share) | £ / shares		£ 1.00		£ 1.00
Ordinary shares issued (in shares)	49,454,726		49,447,473
Ordinary shares outstanding (in shares)	48,844,543		48,655,863
Treasury stock (in shares)	610,183		791,610

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Amount of allowance for credit loss on accounts receivable, classified as current.

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