Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent - Computation of Basic and Diluted Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders	$ (279,261)	$ 272,698	$ (23,544)	$ 623,488
Weighted average ordinary shares outstanding - basic	270,924	289,513	273,616	292,277
Basic earnings per ordinary share & ordinary share equivalents outstanding	$ (1.03)	$ 0.94	$ (0.09)	$ 2.13
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Impact of share-based compensation and certain conversion features	0	4,820	0	4,767
Weighted average ordinary shares outstanding - diluted	270,924	294,333	273,616	297,044
Diluted earnings per ordinary share & ordinary share equivalents outstanding	$ (1.03)	$ 0.93	$ (0.09)	$ 2.10
Dividends per ordinary share	$ 0.16	$ 0.14	$ 0.32	$ 0.28