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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders	$ 72,384	$ 135,648	$ 48,840	$ 759,136
Weighted average ordinary shares outstanding - basic	264,353	285,393	270,494	289,957
Basic earnings per ordinary share & ordinary share equivalents outstanding	$ 0.27	$ 0.48	$ 0.18	$ 2.62
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Impact of share-based compensation and certain conversion features	4,787	5,097	4,418	4,871
Weighted average ordinary shares outstanding - diluted	269,140	290,490	274,912	294,828
Diluted earnings per ordinary share & ordinary share equivalents outstanding	$ 0.27	$ 0.47	$ 0.18	$ 2.57
Dividends per ordinary share	$ 0.16	$ 0.14	$ 0.48	$ 0.42