Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - € / shares
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Ordinary share capital, par value (in EUR per share) € 0.01 € 0.01
Ordinary share capital, shares authorized (in shares) 350,000,000 350,000,000
Ordinary share capital, shares issued (in shares) 141,847,345 151,847,345
Ordinary share capital, shares outstanding (in shares) 131,583,489 142,674,664
Unvested restricted stock (in shares) 2,354,318 2,429,442
Treasury stock, at cost, shares (in shares) 10,263,856 9,172,681