Stockholder's Equity - Changes in the Number of Ordinary Shares Outstanding and Treasury Shares Held by the Company (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Ordinary Shares Outstanding [Abstract]
Beginning balance	239,016,924	237,809,823
Common stock issued	1,907,215	990,039
Purchase of common stock	(569,999)	(300,553)
Ending balance	240,354,140	238,499,309
Ordinary Shares Held as Treasury Shares [Abstract]
Beginning balance	7,824,204	7,400,027
Purchase of common stock	569,999	300,553
Retirement of common stock	(373,776)
Ending balance	8,020,427	7,700,580
Ordinary shares issued at the end of the period	248,374,567	246,199,889