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

Earnings Per Share (Computation Of Ordinary Shares Outstanding, Excluding Unvested Restricted Stock) (Details)

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Earnings Per Share (Computation Of Ordinary Shares Outstanding, Excluding Unvested Restricted Stock) (Details) - shares
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Ordinary share capital, shares issued 187,847,345 203,411,207 212,318,291
Treasury stock, shares (11,600,191) (3,069,003)  
Ordinary shares outstanding 176,247,154 200,342,204 212,318,291
Unvested restricted stock (3,426,810) (3,030,724) (232,140)
Ordinary shares outstanding, excluding unvested restricted stock 172,820,344 197,311,480 212,086,151