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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders	$ 27,282	$ 72,384	$ 978,602	$ 48,841
Weighted average ordinary shares outstanding - basic	301,867	264,353	282,506	270,494
Basic earnings per ordinary share & ordinary share equivalents outstanding	$ 0.09	$ 0.27	$ 3.46	$ 0.18
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Impact of share-based compensation and certain conversion features	5,087	4,787	4,967	4,418
Weighted average ordinary shares outstanding - diluted (in thousands of shares)	306,954	269,140	287,473	274,912
Diluted earnings per ordinary share & ordinary share equivalents outstanding	$ 0.09	$ 0.27	$ 3.40	$ 0.18
Dividends per ordinary share	$ 0.20	$ 0.16	$ 0.52	$ 0.48