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Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Sep. 30, 2020 USD ($) shares	Sep. 30, 2020 £ / shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 £ / shares
Statement of Financial Position [Abstract]
Allowance for doubtful accounts | $	$ 16,241		$ 13,105
Ordinary shares, par value (in pounds per share) | £ / shares		£ 1.00		£ 1.00
Ordinary shares issued (in shares)	49,402,628		49,411,016
Ordinary shares outstanding (in shares)	48,596,417		48,443,830
Treasury stock (in shares)	806,211		967,186

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

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