Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 £ / shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 £ / shares
Statement of Financial Position [Abstract]
Allowance for doubtful accounts \| $	$ 9,464		$ 9,418
Ordinary shares, par value (in Pounds per Share) \| £ / shares		£ 1		£ 1
Ordinary shares issued (shares)	48,693,535		48,290,276
Ordinary shares outstanding (shares)	48,680,054		48,287,346
Treasury stock (shares)	13,481		2,930

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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