Stockholders' Equity, Ordinary shares (Details) - shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Ordinary shares outstanding: [Abstract]
Beginning balance (in shares)	486,969,402
Purchase of ordinary shares (in shares)	(39,106,654)	(46,092,177)
Ending balance (in shares)	452,844,958
Ordinary shares [Member]
Ordinary shares outstanding: [Abstract]
Beginning balance (in shares)	486,969,402	548,824,138
Share-based compensation (in shares)	4,955,719	1,255,317
Warrants exercised (in shares)	1,802	1,018
Employee stock purchase plan (in shares)	24,689	17,789
Purchase of ordinary shares (in shares)	(39,106,654)	(46,092,177)
Ending balance (in shares)	452,844,958	504,006,085