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

Earnings per share (Computations of ordinary shares outstanding, excluding nonvested restricted stock) (Details)

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Earnings per share (Computations of ordinary shares outstanding, excluding nonvested restricted stock) (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Ordinary share issued (in shares) 141,847,345 151,847,345 167,847,345
Treasury shares (in shares) (10,263,856) (9,172,681) (14,855,244)
Ordinary shares outstanding (in shares) 131,583,489 142,674,664 152,992,101
Unvested restricted stock (in shares) (2,354,318) (2,429,442) (3,007,752)
Ordinary shares outstanding, excluding shares of unvested restricted stock (in shares) 129,229,171 140,245,222 149,984,349