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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) $ in Thousands	Jun. 30, 2020 USD ($) shares	Jun. 30, 2020 € / shares	Dec. 31, 2019 € / shares shares
Statement of Financial Position [Abstract]
Investments at fair value | $	$ 199,617
Ordinary share capital, par value (in EUR per share) | € / shares		€ 0.01	€ 0.01
Ordinary share capital, shares authorized (in shares)	350,000,000		350,000,000
Ordinary share capital, shares issued (in shares)	138,847,345		141,847,345
Ordinary share capital, shares outstanding (in shares)	129,672,783		131,583,489
Unvested restricted stock (in shares)	2,087,383		2,354,318
Treasury stock, at cost, shares (in shares)	9,174,562		10,263,856

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Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Unvested

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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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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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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