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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic earnings per ordinary share & ordinary share equivalents outstanding:
Net income (loss) attributable to ordinary shareholders	$ 43,782	$ 915,039	$ 65,667	$ 951,320
Weighted average ordinary shares outstanding - basic	281,793	289,420	286,881	272,665
Basic earnings per ordinary share & ordinary share equivalents outstanding	$ 0.16	$ 3.16	$ 0.23	$ 3.49
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Weighted Average Number Diluted Shares Outstanding Adjustment	3,289	4,563	4,048	4,808
Weighted average ordinary shares outstanding - diluted (in thousands of shares)	285,082	293,983	290,929	277,473
Diluted earnings per ordinary share & ordinary share equivalents outstanding	$ 0.15	$ 3.11	$ 0.23	$ 3.43
Dividends per ordinary share	$ 0.20	$ 0.16	$ 0.40	$ 0.32