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Earnings per share (Computations of basic and diluted earnings per share) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income for the computation of basic EPS	$ 1,076,151	$ 1,046,630	$ 1,178,730
Weighted average ordinary shares outstanding - basic (in shares)	161,059,552	185,514,370	203,850,828
Basic earnings per share (in USD per share)	$ 6.68	$ 5.64	$ 5.78
Weighted average ordinary shares outstanding - diluted (in shares)	167,287,508	189,682,036	206,224,135
Diluted earnings per share (in USD per share)	$ 6.43	$ 5.52	$ 5.72

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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