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
	Mar. 31, 2014	Mar. 31, 2013
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders	$ 255,717	$ 350,790
Weighted average ordinary shares outstanding - basic	276,337	295,000
Basic earnings per ordinary share & ordinary share equivalents outstanding	$ 0.93	$ 1.19
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Impact of share-based compensation and certain conversion features	4,121	4,469
Weighted average ordinary shares outstanding - diluted	280,458	299,469
Diluted earnings per ordinary share & ordinary share equivalents outstanding	$ 0.91	$ 1.17
Dividends per ordinary share	$ 0.16	$ 0.14