Computation of Earnings Per Ordinary Share and Ordinary Share Equivalent - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders	$ 915,039	$ (279,260)	$ 951,320	$ (23,543)
Weighted average ordinary shares outstanding - basic	289,420	270,924	272,665	273,616
Basic earnings per ordinary share & ordinary share equivalents outstanding	$ 3.16	$ (1.03)	$ 3.49	$ (0.09)
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Impact of share-based compensation and certain conversion features	4,563	0	4,808	0
Weighted average ordinary shares outstanding - diluted	293,983	270,924	277,473	273,616
Diluted earnings per ordinary share & ordinary share equivalents outstanding	$ 3.11	$ (1.03)	$ 3.43	$ (0.09)
Dividends per ordinary share	$ 0.16	$ 0.16	$ 0.32	$ 0.32