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								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic earnings per ordinary share and ordinary share equivalents:
Net income (loss) attributable to common shareholders									$ 440,968	$ 1,207,152	$ 188,340
Weighted average ordinary shares outstanding									278,957	286,194	267,103
Basic earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)	$ 1.13	$ 0.26	$ 0.16	$ 0.07	$ 0.77	$ 0.09	$ 3.16	$ 0.14	$ 1.58	$ 4.22	$ 0.71
Diluted earnings per ordinary share and ordinary share equivalents:
Weighted average ordinary shares outstanding									278,957	286,194	267,103
Impact of share based compensation and certain conversion features									3,801	4,805	4,424
Weighted average ordinary shares outstanding - diluted									282,758	290,999	271,527
Diluted earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)	$ 1.12	$ 0.25	$ 0.15	$ 0.07	$ 0.76	$ 0.09	$ 3.11	$ 0.14	$ 1.56	$ 4.15	$ 0.69
Dividends per share paid on ordinary shares									$ 0.80	$ 0.72	$ 0.64