Derivative Instruments (Details) - Schedule of derivative instruments designated as hedges of the net investment in a foreign operation (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Derivatives Disclosure [Abstract]
Weighted average of U.S. dollar equivalent of foreign denominated net assets	$ 1,920,421		$ 1,972,176		$ 1,892,964		$ 1,686,045
Derivative gains (losses)	$ (40,784)	[1]	$ 75,083	[1]	$ (21,879)	[1]	$ 5,876	[1]

[1] Derivative gains (losses) from derivative instruments designated as hedges of the net investment in a foreign operation are recorded in the cumulative translation adjustment account within AOCI for each period.